CN114776753A - Rotary linear vibration damping magnetorheological fluid damper - Google Patents

Abstract

The invention discloses a rotary linear vibration-absorbing magnetorheological fluid damper, comprising an upper end cover, a sleeve, a lower end cover, a rotating shaft, an inertia disk, an upper ring permanent magnet and a lower ring permanent magnet; An arc-shaped groove is opened on the upper part, and the inertia disc and the rotating shaft are connected with the plunger through the arc-shaped groove. The upper end cover is fixed with the upper magnetic frame, and the upper ring permanent magnet is fixed in the upper magnetic frame; the lower end cover is fixed with the lower magnetic frame, and the lower ring permanent magnet is fixed in the lower magnetic frame; there is an excitation coil in the sleeve; the inertia disc and the upper magnetic frame A first damping gap is formed between them; a third damping gap is formed between it and the lower magnetic frame; and a second damping gap is formed with the sleeve. The present invention has a simple structure, and through three damping gaps, the damping effect can be achieved by adjusting the size of the magnetic field according to the actual vibration size.

Description

A rotary linear damping magnetorheological fluid damper

technical field

The invention relates to the technical field of shock absorbers, in particular to a rotary linear vibration-absorbing magnetorheological damper.

Background technique

Magnetorheological materials are called smart materials, which are materials whose rheological properties such as their own viscosity, plasticity, and viscoelasticity change dramatically under the presence of an external magnetic field, including magnetorheological fluids, magnetorheological fluids, and magnetorheological fluids. Grease, magnetorheological elastomer, etc. Magnetorheological fluid is a suspension of micron-sized soft magnetic particles with low coercivity, a carrier liquid with low magnetic permeability and additives added to prevent magnetic particles from settling. The Newtonian fluid form with low viscosity and high fluidity can be rapidly transformed into a semi-solid form with high viscosity and low fluidity under the action of an external magnetic field. When the magnetic field is removed, it will quickly return to the original Newtonian fluid form. Because of the fast and reversible rheological properties of magnetorheological materials, it is possible for magnetorheological materials to be used in construction machinery, intelligent robots, medical, aerospace and other industries in the future.

In recent years, China has gradually begun to pay attention to the application of magnetorheological materials in engineering, and many universities and institutions have explored their practical application. At present, the more mature ones are damping shock absorbers and couplings. Damping shock absorbers can be divided into two categories according to the type of object-oriented vibration: one is a rotary damping shock absorber, which is mainly for rotating devices similar to shafts; the other is a straight-tube damping shock absorber, which is mainly for Linear vibration device similar to suspension. However, the existing straight-tube damping shock absorbers need to leave a lot of space in the axial direction due to engineering application requirements. For some relatively special construction machinery, the working space is small, and it is difficult to directly install the straight-tube damping shock absorbers. ; And the straight-tube damping shock absorber needs to add a large amount of magnetorheological fluid into its cylinder because of its working principle and mode; secondly, if the damping shock absorber is a single-rod type, a volume compensation device must be added in the cylinder. ; In addition, for the straight-tube damping shock absorber, its working area is only a circle between the piston and the cylinder, and the utilization rate of the magnetorheological fluid at both ends of the piston is low. It is prone to settlement and affects its working performance. Aiming at a series of problems faced by the traditional straight-tube damping damper, the present invention designs a rotary linear damping magnetorheological damper.

SUMMARY OF THE INVENTION

Based on the above problems, the present invention proposes a rotary linear damping magnetorheological fluid damper, which is designed according to the rheological properties of magnetorheological materials and the principle of cylindrical cam. The space is smaller, the permanent magnet is built-in without worrying about the settlement of the magnetorheological material, the damping force is larger, and the utilization rate of the magnetorheological material is higher.

The adopted technical scheme is: a rotary linear vibration-absorbing magnetorheological fluid damper, comprising an upper end cover, a sleeve, a lower end cover, a rotating shaft, an inertia disc, an upper ring permanent magnet and a lower ring permanent magnet.

The upper end cover is fixed above the sleeve by bolts, and the lower end cover is fixed under the sleeve by bolts to form a sealed cavity, and an inertia disc is installed in the cavity; bearings are placed in the bearing holes of the upper cover end and the lower end cover, and They are respectively fixed by the upper bearing cover and the lower bearing cover, the bearing and the rotating shaft are in transition fit; the outer side of the rotating shaft is fixed with a connecting sleeve.

An upper magnetic frame is fixed on the upper end cover by bolts, and an upper ring permanent magnet is fixed in the groove of the upper magnetic frame; a first liquid injection hole is also opened on the upper end cover; a second liquid injection hole is opened on the upper magnetic frame; A liquid injection hole communicates with the second liquid injection hole.

A lower magnetic frame is fixed on the lower end cover by bolts, and a lower ring permanent magnet is fixed in the groove of the lower magnetic frame;

The excitation coils are fixed in the sleeve, which are the upper excitation coil fixed on the upper part and the lower excitation coil fixed at the lower part; the upper excitation coil and the upper ring permanent magnet are on the same horizontal line; the lower excitation coil and the lower ring permanent magnet are on the same level horizontal line.

The upper end of the inertia disk is concave, which is matched with the upper magnetic frame and has a gap therebetween, which is the first damping gap;

The lower end of the inertia disc is convex, which is matched with the lower magnetic frame and has a gap therebetween, which is the third damping gap;

There is a gap between one side of the inertia disc and the sleeve, which is the second damping gap;

The other side of the inertia disc is embedded in the connecting sleeve and fixed with the connecting sleeve;

The first damping gap, the second damping gap and the third damping gap communicate with each other; the magnetorheological fluid fills the first damping gap, the second damping gap and the third damping gap through the first liquid injection hole and the second liquid injection hole magnetorheological fluid.

Further, the rotating shaft is an arc groove shaft.

Further, three arc-shaped grooves are opened on the rotating shaft.

Further, the connecting sleeve is provided with a column hole, the connecting sleeve is engaged with the rotating shaft, and is fixed with the arc groove on the rotating shaft through the plunger in the column hole.

Further, the center of the connecting sleeve is cylindrical, and three cylindrical protruding keys are uniformly fixed outside the circle.

The present invention has a simple structure, the rotating shaft and the vibration object are axially connected during use, and the damper placement method is determined according to the vibration amplitude of the vibration object. If the vibration amplitude is small, the distance between the rotating shaft and the end face of the lower end cover can be adjusted, and the damper It is placed on a fixed plane; if the vibration amplitude is large, when placing the present invention, an axial space should be reserved for the rotating shaft, and the damper is fixed by a fixed sleeve.

During vibration reduction, the vibration is first transmitted to the rotating shaft, and the rotating shaft is displaced axially. At this time, the plunger engaged with the arc-shaped groove of the rotating shaft will rotate, which in turn drives the inertial disk embedded and connected with the connecting sleeve to rotate to realize the straight line. Vibration is converted into rotational motion.

When the vibration intensity is small, the damping generated by the first damping gap and the third damping gap can be damped only by the upper annular permanent magnet and the lower annular permanent magnet; when the vibration intensity is large, the upper excitation coil and the lower excitation coil can be connected, The damping generated by the second damping gap is increased to reduce vibration; at this time, the upper excitation coil and the upper annular permanent magnet, and the lower excitation coil and the lower annular permanent magnet respectively generate closed magnetic fields, and the magnetic lines of force of the two closed magnetic fields coincide in the second damping gap. The magnetic field in the first damping gap, the second damping gap, and the third damping gap are enhanced, and the damping force generated by the damping gap is also greatly enhanced. In actual use, the excitation size of the coil can be adjusted according to the external excitation vibration, and the vibration energy can be converted For thermal energy, to achieve the purpose of vibration reduction.

In the present invention, the rotating shaft is an arc slot shaft, which is connected with the inertia disc by an arc slot and a plunger, so as to achieve the purpose of converting the linear reciprocating vibration of the arc slot shaft into the rotational vibration of the inertia disc. There are a pair of magnetic frames, a pair of ring magnets and a first damping gap and a third damping gap between them. When the vibration force is small, the first damping gap and the third damping gap can generate a small damping force. If the vibration force of the external device is large, a sufficient magnetic field can be generated through the excitation coil on the inner wall of the sleeve. At this time, the magnetic field generated by the excitation coil and the magnetic field of the permanent magnet together constitute the first damping gap, the second damping gap and the And the closed-loop magnetic circuit of the third damping gap, the three damping gaps work at the same time, and the damper provides sufficient damping.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of the cross section of the present invention;

FIG. 3 is a schematic structural diagram of the cooperation between the rotating shaft and the connecting sleeve in the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and through the examples. The following examples are to explain the present invention and the present invention is not limited to the following examples.

Referring to Figures 1 to 3, a rotary linear vibration-damping magnetorheological fluid damper includes an upper end cover 3, a sleeve 10, a lower end cover 14, a rotating shaft 7, an inertia disc 9, an upper ring permanent magnet 4, a lower end cover Ring permanent magnet 12 .

The upper end cover 3 is fixed above the sleeve 10 by bolts, and the lower end cover 14 is fixed under the sleeve 10 by bolts to form a sealed cavity, and the inertia disc 9 is installed in the cavity; the bearings of the upper cover end 3 and the lower end cover 14 A bearing 8 is placed in the hole and is fixed by the upper bearing cover 6 and the lower bearing cover 17 respectively. The bearing 8 and the rotating shaft 7 are in transition fit; the outer side of the rotating shaft 7 is fixed with a connecting sleeve 18 .

The rotating shaft 7 is an arc-slot shaft with three arc-shaped slots 16 . The connecting sleeve 18 is provided with a column hole. The connecting sleeve 18 is engaged with the rotating shaft 7 and is fixed to the arc groove 16 on the rotating shaft 7 through the plunger 15 in the column hole. The center of the connecting sleeve 18 is cylindrical, and three cylindrical protruding keys 181 are uniformly fixed outside the circle.

The upper magnetic frame 5 is fixed on the upper end cover 3 by bolts, and the upper ring permanent magnet 4 is fixed in the groove of the upper magnetic frame 5; the upper end cover 3 is also provided with a first liquid injection hole 2; The second liquid injection hole 51 ; the first liquid injection hole 2 communicates with the second liquid injection hole 51 .

A lower magnetic frame 13 is fixed on the lower end cover 14 by bolts, and a lower ring permanent magnet 12 is fixed in the groove of the lower magnetic frame 13 .

Excitation coils are fixed in the sleeve 10, which are the upper excitation coil 1 fixed at the upper part and the lower excitation coil 11 fixed at the lower part; the upper excitation coil 1 and the upper ring permanent magnet 4 are on the same horizontal line; the lower excitation coil 11 and The lower ring permanent magnets 5 are on the same horizontal line.

The upper end of the inertia disk 9 is concave, which is matched with the upper magnetic frame 5 and there is a gap therebetween, which is the first damping gap 21; Three damping gaps 19 ; there is a gap between one side of the inertia disc 9 and the sleeve 10 , which is the second damping gap 20 ;

The first damping gap 21 , the second damping gap 20 and the third damping gap 19 communicate with each other; the magnetorheological fluid passes through the first liquid injection hole 2 and the second liquid injection hole 51 to connect the first damping gap 21 and the second damping gap 20 And the third damping gap 19 is filled with magnetorheological fluid.

Claims (6)

1. A rotary linear vibration damping magnetorheological fluid damper is characterized in that: the device comprises an upper end cover, a sleeve, a lower end cover, a rotating shaft, an inertia disc, an upper ring permanent magnet and a lower ring permanent magnet;

the upper end cover is fixed above the sleeve through a bolt, the lower end cover is fixed below the sleeve through a bolt to form a sealed cavity, and the inertia disc is installed in the cavity; bearings are placed in the bearing holes of the upper cover end and the lower cover and are fixed by the upper bearing cover and the lower bearing cover respectively, and the bearings are in transition fit with the rotating shaft; a connecting sleeve is fixed on the outer side of the rotating shaft;

the upper end cover is fixed with an upper magnetic frame through a bolt, and the upper ring permanent magnet is fixed in the upper magnetic frame; the upper end cover is provided with a first liquid injection hole; the upper magnetic frame is provided with a second liquid injection hole;

the lower end cover is fixed with a lower magnetic frame through a bolt, and the lower ring permanent magnet is fixed in the lower magnetic frame;

the inside of the sleeve is fixed with an excitation coil which is an upper excitation coil fixed at the upper part and a lower excitation coil fixed at the lower part;

the upper end of the inertia disc is concave, and a gap is reserved between the inertia disc and the upper magnetic frame and is a first damping gap;

the lower end of the inertia disc is convex, and a gap is reserved between the inertia disc and the lower magnetic frame and is a third damping gap;

a gap is reserved between one side of the inertia disc and the sleeve and is a second damping gap;

the other side of the inertia disc is embedded into the connecting sleeve and is fixed with the connecting sleeve;

the first damping gap, the second damping gap and the third damping gap are communicated; magnetorheological fluid is filled in the first damping gap, the second damping gap and the third damping gap through the first liquid injection hole and the second liquid injection hole.

2. The rotary linear vibration damping magnetorheological fluid damper according to claim 1, wherein the shaft is an arc grooved shaft.

3. The rotary linear vibration damping magnetorheological fluid damper as recited in claim 2, wherein the shaft has three arcuate slots formed therein.

4. The rotary linear vibration damping magnetorheological fluid damper as recited in claim 1, wherein the coupling sleeve has a cylindrical bore, the coupling sleeve engaging the shaft and being secured to the arcuate slot in the shaft by a plunger in the cylindrical bore.

5. The rotary linear vibration damping magnetorheological fluid damper as claimed in claim 1, wherein the connecting sleeve is cylindrical in center and three cylindrical convex keys are uniformly fixed outside the circle.

6. A rotary linear damper magnetorheological fluid damper according to claim 1 wherein the upper field coil is level with the upper ring permanent magnet; the lower excitation coil and the lower ring permanent magnet are on the same horizontal line.

Images