CN216242022U - An electromagnetic vibration isolator with high static and low dynamic stiffness - Google Patents

Abstract

The utility model belongs to the technical field of low-frequency vibration isolation structures, in particular to an electromagnetic vibration isolator with high static and low dynamic stiffness. It includes a vibration isolation base and positive stiffness components and negative stiffness components arranged on the vibration isolation base; the vibration isolation base includes: a movable plate, a support plate, a plurality of guide shafts and compression springs; the positive stiffness component includes: an armature connecting piece , suspension bracket, first electromagnet, armature; negative stiffness component includes: second electromagnet, magnet guide mechanism, permanent magnet, limit mechanism; the utility model is used to solve practical engineering, when working conditions, external excitation changes and When the elastic element is aging, the vibration isolation performance of the vibration isolator decreases or does not match the original vibration isolation characteristics. It uses two stiffness devices with electromagnets to adjust the dynamic and static parameters of the system so that it can cope with the problem The influence of working conditions or system structure changes on the original system makes the high static and low dynamic stiffness vibration isolator always maintain the required vibration isolation performance.

Description

An electromagnetic vibration isolator with high static and low dynamic stiffness

technical field

The utility model belongs to the technical field of low-frequency vibration isolation structures, in particular to an electromagnetic vibration isolator with high static and low dynamic stiffness.

Background technique

The high static and low dynamic stiffness vibration isolator is to connect the positive stiffness mechanism and the negative stiffness mechanism in parallel. The positive stiffness mechanism determines the bearing capacity of the vibration isolator, and the negative stiffness mechanism is used to reduce the dynamic stiffness of the system. Therefore, the high static and low dynamic stiffness vibration isolator has high static stiffness and low dynamic stiffness, which can bear the larger load mass of the equipment, and at the same time make the equipment have low dynamic stiffness when it vibrates at the static equilibrium position. However, the structures of the high-static and low-dynamic stiffness vibration isolators currently studied are very complex, and the installation and use are very inconvenient.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide an electromagnetic vibration isolator with high static and low dynamic stiffness that is easy to install and use, has low production, use and maintenance costs, and has good practicability.

To achieve the above purpose, the present invention adopts the following technical solutions.

An electromagnetic vibration isolator with high static and low dynamic stiffness, comprising a mounting base 1 and a positive stiffness component 2 and a negative stiffness component 3 arranged on the mounting base 1;

The installation base 1 includes: a movable plate 1a, a support plate 1b, a plurality of guide shafts 1c and an elastic support 1d;

The support plate 1b is fixedly arranged, and the guide shaft 1c is vertically arranged on the support plate 1b; the movable plate 1a is arranged on the upper side of the support plate 1b, and the movable plate 1a is provided with a through hole which can be sleeved on the guide shaft 1c; The holes are evenly arranged on the edge of the movable plate 1a; the support plate 1b is provided with through holes at corresponding positions; the support plate 1b is provided with through holes at corresponding positions; the through holes and the through holes are provided with sliding bearings 1e, the guide The shaft 1c is sleeved in the sliding bearing 1e; the positive stiffness component 2 and the negative stiffness component 3 are arranged between the movable plate 1a and the supporting plate 1b, and the two ends of the elastic support 1d respectively press against the movable plate 1a and the supporting plate 1b;

The positive stiffness component 2 includes: an armature connecting piece 2a, a suspension bracket 2b, a first electromagnet 2c, and an armature 2d; the suspension bracket 2b is fixed on the support plate 1b, and the first electromagnet 2c is fixed on the suspension bracket 2b; the armature The upper end of the connecting piece 2a is fixed on the movable plate 1a, and the lower end extends downward and is close to the suspension bracket 2b; the armature 2d is fixedly arranged on the lower end of the armature connecting piece 2a and extends toward the side of the first electromagnet 2c, and the first electromagnet 2c is energized to generate Magnetic force so that the armature connecting piece 2a has the force to move up and down;

The negative stiffness component 3 includes: a second electromagnet 3a, a magnet guide mechanism 3b, a permanent magnet 3c, and a limit mechanism 3d;

The second electromagnet 3a is fixedly arranged on the support plate 1b, and the magnetic core of the second electromagnet 3a is arranged horizontally along the left-right direction;

The magnet guide mechanism 3b includes: two linear guide rails 3e symmetrically arranged on the left and right sides of the second electromagnet 3a, and two permanent magnet support seats 3f arranged on the linear guide rail 3e;

The permanent magnet support base 3f can move left and right on the linear guide rail 3e; there are two permanent magnets 3c and are respectively arranged on the two permanent magnet support bases 3f;

The limit mechanism 3d includes: two horizontal push rods 3g connected to the permanent magnet support base 3f, and two limit arms 3j connected to the movable plate 1a;

The horizontal push rod 3g protrudes away from the second electromagnet 3a in the horizontal direction to form a pressing portion 30g;

The lower end of the limiting arm 3j is provided with a guide portion 3k, the height of the guide portion 3k is the same as that of the horizontal push rod 3g, and an arc-shaped guide surface 30k is provided on the side facing the horizontal push rod 3g;

The pressing portion 30g abuts against the arcuate guide surface 30k and moves vertically along the arcuate guide surface 30k.

A further improvement or preferred embodiment of the aforementioned electromagnetic vibration isolator with high static and low dynamic stiffness further includes that the movable plate 1a is a rectangular flat plate, and the through holes are arranged at the four corners of the movable plate 1a; The guide rod 1g is fixed on the support plate 1b, the guide rod 1g is sleeved with an elastic support, and the movable plate 1a is provided with a hole for the guide rod 1g to pass through.

A further improvement or preferred embodiment of the aforementioned electromagnetic vibration isolator with high static and low dynamic stiffness further includes that the negative stiffness component 3 is arranged at the center of the support plate 1b, and the positive stiffness component 2 is arranged on the front side of the negative stiffness component 3 or rear side;

The armature connecting piece 2a has an L-shaped structure, including a vertical connecting arm 20a vertically disposed on the front side or the rear side of the negative stiffness assembly 3, and a vertical connecting arm 20a connected to the top of the vertical connecting arm 20a and extending to the center of the support plate 1b. The lateral connecting arm 20b is provided with a connecting plate 20c on the upper side of the distal end of the lateral connecting arm 20b, and the connecting plate 20c is detachably connected to the center of the lower end surface of the movable plate 1a.

A further improvement or preferred embodiment of the aforementioned electromagnetic vibration isolator with high static and low dynamic stiffness further includes that the suspension bracket 2b is arranged on the front side or the rear side of the negative stiffness component 3; the suspension bracket 2b is in an indented structure;

The first electromagnet 2c includes: an E-shaped silicon steel sheet group 20d respectively arranged on the two transverse arms of the indented suspension support 2b, a differential coil 20e wound on the E-shaped silicon steel sheet group 20d; two E-shaped silicon steel sheet groups 20d; The openings of the E-shaped silicon steel sheet group 20d are arranged facing each other; the armature 2d extends horizontally between the two E-shaped silicon steel sheet groups 20d.

A further improvement or preferred embodiment of the aforementioned electromagnetic vibration isolator with high static and low dynamic stiffness further includes that the negative stiffness component 3 further includes an electromagnet support base, and the electromagnet support base consists of a support rod 30a and a support rod 30a provided with the top end. The electromagnet mounting frame 30b is composed; the support rod 30a is perpendicular to the support plate 1b and the lower end is fixed at the center position of the upper end surface of the support plate 1b; the second electromagnet 3a is fixedly installed on the electromagnet mounting frame 30b.

A further improvement or preferred embodiment of the aforementioned electromagnetic vibration isolator with high static and low dynamic stiffness further includes that the second electromagnet 3a includes a cylindrical permanent magnet 30c and a helical coil 30d;

The negative stiffness assembly 3 further includes a guide rail mounting seat 30e, which is respectively installed on the left and right sides of the electromagnet support seat; the linear guide rail 3e is installed on the top of the guide rail mounting seat 30e; the lower end of the permanent magnet support seat 3f is provided with a The slider 30f to which the linear guide 3e is fitted.

A further improvement or preferred embodiment of the aforementioned electromagnetic vibration isolator with high static and low dynamic stiffness further includes that the pressing portion 30g is a spherical structure; The pressing portion 30g slides along a guide groove with a semicircular cross section.

A further improvement or preferred embodiment of the aforementioned electromagnetic vibration isolator with high static and low dynamic stiffness further includes that the elastic support member 1d refers to a compression spring, and the compression spring is sleeved on the guide shaft 1c.

Its beneficial effects are:

The utility model is used to solve the problems that the existing similar equipment or products have complex structure, inconvenient use and control, and industrial application type inspection. It can easily change and control the overall stiffness and vibration isolation parameters of the system by controlling the current of the two electromagnets. It is small in size and stable in support, which is easy to use in various types of vibration isolation occasions, and has a good industrial application prospect.

Description of drawings

Figure 1 is a front view of an electromagnetic vibration isolator with high static and low dynamic stiffness;

Figure 2 is an oblique view of an electromagnetic vibration isolator with high static and low dynamic stiffness;

Figure 3 is a side view of an electromagnetic vibration isolator with high static and low dynamic stiffness;

Fig. 4 is the structural schematic diagram 1 of the positive stiffness component;

Fig. 5 is the second structural schematic diagram of the positive stiffness component;

Fig. 6 is the structural schematic diagram 1 of the negative stiffness component;

Fig. 7 is the second structural schematic diagram of the negative stiffness component;

The reference numerals include:

Mounting base 1, movable plate 1a, support plate 1b, multiple guide shafts 1c, elastic support 1d, sliding bearing 1e, guide rod 1g, positive stiffness component 2, armature connecting piece 2a, connecting arm 20a, connecting arm 20b, The connecting plate 20c, the E-shaped silicon steel sheet group 20d, the differential coil 20e, the suspension bracket 2b, the first electromagnet 2c, the armature 2d, the negative stiffness component 3, the second electromagnet 3a, the magnet guide mechanism 3b, the permanent magnet 3c, the limiter Position mechanism 3d, linear guide 3e, permanent magnet support base 3f, horizontal push rod 3g, support rod 30a, electromagnet mounting frame 30b, columnar permanent magnet 30c, helical coil 30d, guide rail mounting base 30e, slider 30f, extrusion part 30g, limit arm 3j, guide portion 3k, arc guide surface 30k.

Detailed ways

The present utility model will be described in detail below in conjunction with specific embodiments.

A high static and low dynamic stiffness electromagnetic vibration isolator of the present invention comprises an installation base 1 and a positive stiffness component 2 and a negative stiffness component 3 arranged on the installation base 1;

As shown in Figures 1 and 2, the installation base 1 includes: a movable plate 1a, a support plate 1b, a plurality of guide shafts 1c and an elastic support 1d;

The support plate 1b is fixedly arranged, the guide shaft 1c is vertically arranged on the support plate 1b; the movable plate 1a is arranged on the upper side of the support plate 1b, and the movable plate 1a is provided with a through hole that can be sleeved on the guide shaft 1c; the compression bomb 1d It is sleeved on the guide shaft 1c, and the two ends are respectively against the movable plate 1a and the support plate 1b; the positive stiffness component 2 and the negative stiffness component 3 are arranged between the movable plate 1a and the support plate 1b;

The mounting base is used for overall support and connection, and at the same time as a connection and fixing structure between the rigidity mechanism and the support structure and the equipment or objects to be isolated from vibration. Formed, the movable plate 1a can move up and down to support the real equipment or structure. In actual use, the movable plate and the supporting plate are not necessarily standard flat plate structures, but may also be box-shaped or various types that are convenient for fixing and fixing according to needs. Supported platform fixed structure.

As a general and concise structural solution, the movable plate 1a can be designed as a flat plate. In order to ensure the stability of the upper device, the movable plate 1a is arranged horizontally; For positioning, fixing and supporting, the movable plate is supported by the bottom spring. In order to ensure the balanced force, the through holes used to control the distribution position of the springs are evenly arranged on the edge of the movable plate 1a; the supporting plate 1b is provided with through holes at the corresponding positions; A sliding bearing 1e is arranged in the hole and the through hole, and the guide shaft 1c is sleeved in the sliding bearing 1e. Sliding bearings are beneficial to improve the smoothness of the up and down movement of the movable plate, reduce wear, and make the vibration isolation system more flexible.

In order to facilitate processing and assembly, in this embodiment, the movable plate 1a is a rectangular flat plate, and the through holes are arranged at the four corners of the movable plate 1a;

In order to improve the stability of the device, ensure that the movable plate 1a can be stably supported, and prevent the tilting and jamming, if necessary, a guide rod 1g can be provided between the guide shafts 1c. The guide rod 1g is fixed on the support plate 1b and the guide rod 1g. The sleeve is provided with an elastic support, and the movable plate 1a is provided with a hole for the guide rod 1g to pass through. The guide rod 1g is used for support, and at the same time assists the guide shaft to limit, guide and assemble and align.

As shown in FIG. 3 and FIG. 4 , the positive stiffness component 2 includes: an armature connecting piece 2a, a suspension bracket 2b, a first electromagnet 2c, and an armature 2d;

The suspension bracket 2b is fixed on the support plate 1b, and the first electromagnet 2c is fixedly arranged on the suspension bracket 2b; the upper end of the armature connecting piece 2a is fixed on the movable plate 1a, and the lower end extends downward and is close to the suspension bracket 2b; the armature 2d is fixedly arranged on the movable plate 1a. The lower end of the armature connecting piece 2a extends toward the side of the first electromagnet 2c, and the first electromagnet 2c is energized to generate a magnetic force so that the armature connecting piece 2a has a force to move up and down;

In the specific use process, the armature can be forced and moved up and down under the action of electromagnetic force, and finally drive the armature connecting piece and the upper movable plate 1a to be stressed and moved, and then control the parameters of the positive stiffness system, the electromagnet is fixed on the support plate 1b, It is the interaction between the support plate and the movable plate.

Wherein, the suspension bracket 2b is arranged on the front side or the rear side of the negative stiffness component 3; in order to facilitate the installation of the silicon steel sheet group on the electromagnet, the suspension bracket 2b adopts an indented structure;

The first electromagnet 2c includes: an E-shaped silicon steel sheet group 20d respectively arranged on the two transverse arms of the indented suspension support 2b, a differential coil 20e wound on the E-shaped silicon steel sheet group 20d; two E-shaped silicon steel sheet groups 20d; The openings of the sheet group 20d are arranged facing each other; the armature 2d extends horizontally between the two E-shaped silicon steel sheet groups 20d.

As shown in Figures 6 and 7, similar to the structure principle of the positive stiffness system, the negative stiffness component 3 includes: a second electromagnet 3a, a magnet guide mechanism 3b, a permanent magnet 3c, and a limit mechanism 3d;

The second electromagnet 3a is fixedly arranged on the support plate 1b, and the magnetic core of the second electromagnet 3a is arranged horizontally along the left-right direction;

The magnet guide mechanism 3b includes: two linear guide rails 3e symmetrically arranged on the left and right sides of the second electromagnet 3a, and two permanent magnet support seats 3f arranged on the linear guide rail 3e;

The permanent magnet support base 3f can move left and right on the linear guide rail 3e; there are two permanent magnets 3c and are respectively arranged on the two permanent magnet support bases 3f;

The limit mechanism 3d includes: two horizontal push rods 3g connected to the permanent magnet support base 3f, and two limit arms 3j connected to the movable plate 1a;

The horizontal push rod 3g protrudes away from the second electromagnet 3a in the horizontal direction to form a pressing portion 30g;

The lower end of the limiting arm 3j is provided with a guide portion 3k, the height of the guide portion 3k is the same as that of the horizontal push rod 3g, and an arc-shaped guide surface 30k is provided on the side facing the horizontal push rod 3g; the extrusion portion 30g abuts against the arc-shaped guide surface 30k And move vertically along the arc-shaped guide surface 30k, in order to ensure the relative movement of the two is stable and vertically aligned, in this embodiment, the extrusion part 30g is a spherical structure; the arc-shaped guide surface 30k is provided with a half In the circular guide groove, the pressing portion 30g extends into the semicircular guide groove and slides along the semicircular guide groove.

In order to facilitate the overall structure, and to adjust and restore the stiffness characteristics of the system, as a preferred solution, in this embodiment, the negative stiffness component 3 is arranged at the center of the support plate 1b, and the positive stiffness component 2 is arranged on the front side or the rear side of the negative stiffness component 3;

In order to ensure the balance of the position of the force bearing point, the armature connecting piece 2a has an L-shaped structure, including a vertical connecting arm 20a vertically arranged on the front or rear side of the negative stiffness component 3, and a vertical connecting arm 20a connected to the top of the vertical connecting arm 20a and extending. To the horizontal connecting arm 20b at the center of the support plate 1b, the upper end of the horizontal connecting arm 20b is provided with a connecting plate 20c, and the connecting plate 20c is detachably connected to the center of the lower end surface of the movable plate 1a.

The negative stiffness component 3 also includes an electromagnet support seat, which is composed of a support rod 30a and an electromagnet mounting frame 30b provided with the top end of the support rod 30a; the support rod 30a is perpendicular to the support plate 1b and the lower end is fixed on the support plate 1b The center position of the end face; the second electromagnet 3a is fixedly installed on the electromagnet mounting frame 30b.

The second electromagnet 3a includes a columnar permanent magnet 30c and a helical coil 30d;

The negative stiffness component 3 also includes a guide rail mounting seat 30e, which is respectively installed on the left and right sides of the electromagnet support seat; the linear guide rail 3e is installed on the top of the guide rail mounting seat 30e; the lower end of the permanent magnet support seat 3f is provided with a linear guide rail. 3e with the slider 30f.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Persons should understand that the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims (8)

1. An electromagnetic vibration isolator with high static and low dynamic stiffness, characterized in that it comprises a mounting base (1) and a positive stiffness component (2) and a negative stiffness component (3) arranged on the mounting base (1); The installation base (1) comprises: a movable plate (1a), a support plate (1b), a guide shaft (1c) and an elastic support (1d); The support plate (1b) is fixedly arranged, the guide shaft (1c) is vertically arranged on the support plate (1b); the movable plate (1a) is arranged on the upper side of the support plate (1b), and the movable plate (1a) is provided with a sleeveable A through hole on the guide shaft (1c); the through hole is evenly arranged on the edge of the movable plate (1a); the support plate (1b) is provided with a through hole at a corresponding position; a sliding bearing is arranged in the through hole and the through hole (1e), the guide shaft (1c) is sleeved in the sliding bearing (1e); the positive stiffness component (2) and the negative stiffness component (3) are arranged between the movable plate (1a) and the support plate (1b), The two ends of the elastic support member (1d) respectively abut against the movable plate (1a) and the support plate (1b); The positive stiffness component (2) comprises: an armature connecting piece (2a), a suspension bracket (2b), a first electromagnet (2c), and an armature (2d); The suspension bracket (2b) is fixed on the support plate (1b), the first electromagnet (2c) is fixedly arranged on the suspension bracket (2b); the upper end of the armature connecting piece (2a) is fixed on the movable plate (1a), and the lower end is downward extending and close to the suspension bracket (2b); the armature (2d) is fixedly arranged at the lower end of the armature connecting piece (2a) and extends toward the side of the first electromagnet (2c), and the first electromagnet (2c) is energized to generate a magnetic force to make the armature The connecting piece (2a) has a force to move up and down; The negative stiffness component (3) includes: a second electromagnet (3a), a magnet guide mechanism (3b), a permanent magnet (3c), and a limit mechanism (3d); The second electromagnet (3a) is fixedly arranged on the support plate (1b), and the magnetic core of the second electromagnet (3a) is arranged horizontally along the left-right direction; The magnet guide mechanism (3b) comprises: two linear guide rails (3e) symmetrically arranged on the left and right sides of the second electromagnet (3a), and two permanent magnet support seats (3f) arranged on the linear guide rail (3e); The permanent magnet support base (3f) can move left and right on the linear guide rail (3e); there are two permanent magnets (3c) and are respectively arranged on the two permanent magnet support bases (3f); The limit mechanism (3d) comprises: two horizontal push rods (3g) connected to the permanent magnet support base (3f), and two limit arms (3j) connected to the movable plate (1a); The horizontal push rod (3g) protrudes away from the second electromagnet (3a) in the horizontal direction to form a pressing portion (30g); The lower end of the limiting arm (3j) is provided with a semicircular guide portion (3k), the height of the semicircular guide portion (3k) is the same as the height of the horizontal push rod (3g) and an arc is provided on the side facing the horizontal push rod (3g). Shaped guide surface (30k); The pressing part (30g) abuts against the arc-shaped guide surface (30k) and moves vertically along the arc-shaped guide surface (30k). 2. The electromagnetic vibration isolator with high static and low dynamic stiffness according to claim 1, wherein the movable plate (1a) is a rectangular flat plate, and the through holes are arranged at four corners of the movable plate (1a); It also includes a guide rod (1g) arranged between the guide shafts (1c), the guide rod (1g) is fixedly arranged on the support plate (1b), the guide rod (1g) is sleeved with an elastic support, and the movable plate (1a) ) is provided with a hole for the guide rod (1g) to pass through. 3. The electromagnetic vibration isolator with high static and low dynamic stiffness according to claim 1, wherein the negative stiffness component (3) is arranged at the center of the support plate (1b), and the positive stiffness component (2) ) is arranged on the front side or the rear side of the negative stiffness component (3); The armature connecting piece (2a) has an L-shaped structure, and includes a vertical connecting arm (20a) vertically disposed on the front side or the rear side of the negative stiffness component (3), and a vertical connecting arm (20a) connected to the top end of the vertical connecting arm (20a). A transverse connecting arm (20b) extending to the center of the support plate (1b), a connecting plate (20c) is provided on the upper side of the end of the transverse connecting arm (20b), and the connecting plate (20c) is detachably connected to the movable plate (1a) The center position of the lower end face. 4. The electromagnetic vibration isolator with high static and low dynamic stiffness according to claim 3, wherein the suspension bracket (2b) is arranged on the front side or the rear side of the negative stiffness component (3); the suspension bracket (2b) ) is in the shape of an indented structure; The first electromagnet (2c) comprises: E-shaped silicon steel sheet groups (20d) respectively arranged on the two transverse arms of the indented suspension support (2b), and E-shaped silicon steel sheet groups (20d) wound on the E-shaped silicon steel sheet group (20d). Differential coil (20e); The openings of the two E-shaped silicon steel sheet groups (20d) are arranged facing each other; the armature (2d) extends horizontally between the two E-shaped silicon steel sheet groups (20d). 5. The electromagnetic vibration isolator with high static and low dynamic stiffness according to claim 1, wherein the negative stiffness component (3) further comprises an electromagnet support seat, and the electromagnet support seat is formed by a support rod (30a) and an electromagnet mounting frame (30b) provided with the top end of the support rod (30a); the support rod (30a) is perpendicular to the support plate (1b) and the lower end is fixed at the center position of the upper end face of the support plate (1b); the second electromagnet ( 3a) Fix it on the electromagnet mounting bracket (30b). 6. The electromagnetic vibration isolator with high static and low dynamic stiffness according to claim 5, wherein the second electromagnet (3a) comprises a cylindrical permanent magnet (30c) and a helical coil (30d); The negative stiffness component (3) further comprises a guide rail mounting seat (30e), the guide rail mounting seat (30e) is respectively installed on the left and right sides of the electromagnet support seat; the linear guide rail (3e) is installed on the top of the guide rail mounting seat (30e); The lower end of the magnet support seat (3f) is provided with a sliding block (30f) which can be matched with the linear guide rail (3e). 7 . The electromagnetic vibration isolator with high static and low dynamic stiffness according to claim 1 , wherein the extrusion part ( 30 g ) is a spherical structure; the arc guide surface ( 30 k ) is provided with a cross section. 8 . It is a semicircular guide groove, and the pressing part (30g) slides along the guide groove. 8 . The electromagnetic vibration isolator with high static and low dynamic stiffness according to claim 1 , wherein the elastic support member ( 1 d ) is a compression spring, and the compression spring is sleeved on the guide shaft ( 1 c ). 9 . superior.

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