CN102205308A - Force-controlled electromagnetic permanent magnetic composite excitation vibration platform - Google Patents

Abstract

A force-controlled electromagnetic permanent magnet composite excitation vibration table in the technical field of electromagnetic drives, comprising: a housing, an electromagnetic coil, a magnetic energy body and an object-carrying mechanism, and two magnetic energy bodies are arranged up and down inside the housing in the form of horizontal rotating shafts and mutually For contact, the two electromagnetic coils are respectively arranged inside the casing and on both sides of the magnetic energy body, and the object-carrying mechanism is movably arranged on the top of the casing and is in contact with a magnetic energy body. This device realizes a direct displacement drive through electromagnetic excitation of the rigid magnetic energy body, which has the advantages of simple structure, high reliability and driving efficiency, no hidden danger of moving coil and wire follow-up, accurate and controllable amplitude, and can be realized from below 5Hz, that is, from quasi Broadband, large load, large displacement vibration devices or equipment from static to high frequency.

Description

Force-controlled electromagnetic permanent magnet composite excitation shaking table

technical field

The invention relates to a device in the technical field of electromagnetic drives, in particular to a force-controlled electromagnetic permanent magnet composite excitation vibration table.

Background technique

In recent years, due to the need for vibration testing of aircraft or precision equipment in the fields of aerospace, aviation, and navigation, the demand for high-performance vibration testing equipment has become more and more urgent. At present, vibration equipment mainly includes hydraulic, pneumatic, electromagnetic and mechanical vibration equipment. Among them, hydraulic, pneumatic and mechanical vibration equipment can no longer meet the requirements of vibration test performance in aerospace and other fields due to the low drive frequency and many drive control links. Because the electromagnetic drive is controlled by electromagnetic signals, the realization of the drive is realized by the action of electromagnetic energy. The control is convenient and the response is sensitive. It is especially suitable for the realization of high-frequency vibration equipment. Therefore, most of the current high-performance vibration equipment is realized by the driving link of electromagnetic drive. For example, the electromagnetic vibrating table of the British Ling company, its equipment driving principle is based on the driving principle of the voice coil motor, usually the driving coil is used as the stator, and a mover suspended in the center of the driving coil is driven by alternating electromagnetic force to generate vibration. However, this type of electromagnetically driven vibrating table also has obvious defects, mainly because the mover is always in a suspended working state, and vibration driving below 5 Hz is difficult to achieve, and the dynamic rigidity in the driving process is insufficient due to the suspension driving during the driving process. In addition, its high-frequency driving displacement is small, the driving amplitude is inaccurate, and the driving energy consumption is relatively large.

After searching the existing technology, it is found that the application date of Chinese patent number ZL200820087256.0 is 2008-5-16, which records an "electromagnetic vibrating table". The technology includes a table body, which includes a first magnet, a first The transition block, the central magnetic guide column, the second transition block, and the second magnet. The center magnetic guide post is covered with a moving coil; it also includes a motion table and two frame-shaped air bearing guide rails. The motion table is slidably set on the air bearing. In the guide rail; it also includes the driving motor and the screw rod connected to it. The screw rod is connected to a carriage, and the lead wire and air pipe are connected to the carriage; The grating reading head facing the ruler and the communication block connected with the grating reading head, the communication block is connected with a controller, and the driving motor is connected with the controller signal. The advantage of this patent is that it provides an electromagnetic vibrating table with complete peripheral equipment. The controller controls the motor to drive the screw puller to move synchronously with the moving table, so that the additional force of the air intake pipe and the electric lead wire does not affect the large stroke of the vibrating table and Distortion of low frequency waveforms.

However, this prior art is realized through a voice coil motor drive form "with a moving coil", and requires drive transmission links such as a drive motor and a screw rod connected thereto. In this way, the vibration equipment based on the dynamic coil drive is difficult or impossible to achieve low-frequency drive within 5 Hz, and its drive involves many components and links. The drive also requires the motor and the screw and screw mechanism to follow the movement by controlling the traction carriage. The synchronous movement of the platform, as well as the side effects such as the involvement of the intake pipe and the electrical lead wire and additional force, make the entire platform unable to achieve efficient direct drive and high reliability drive.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a force-controlled electromagnetic permanent magnet composite excitation vibration table, which uses a magnetic energy body with a different direction to generate magnetic pole deflection under the action of electric and magnetic excitations, so that the magnetic energy body with a different direction in its direction is deflected. In the process of changing the length direction, it produces a rigid and direct driving effect on the mechanism in contact with it, resulting in a large driving effect. This device realizes a direct displacement drive through electromagnetic excitation of the rigid magnetic energy body, which has the advantages of simple structure, high reliability and driving efficiency, no hidden danger of moving coil and wire follow-up, accurate and controllable amplitude, and can be realized from below 5Hz, that is, from quasi Broadband, large load, large displacement vibration devices or equipment from static to high frequency.

The present invention is achieved through the following technical solutions. The present invention includes: a housing, an electromagnetic coil, a magnetic energy body and an object-carrying mechanism, wherein: two magnetic energy bodies are respectively arranged up and down inside the housing in the form of horizontal rotating shafts and are in contact with each other, and the electromagnetic coil It is arranged inside the casing and facing the second magnetic energy body, and the object carrying mechanism is movably arranged on the top of the casing and contacts with a magnetic energy body.

The housing includes: a base, a rotating shaft supporting frame, an inner frame of the magnetic circuit and an outer frame of the fuselage, wherein: the outer frame of the fuselage is fixedly connected with the base, and the supporting frame of the rotating shaft and the inner frame of the magnetic circuit are respectively fixed on the The fuselage outer frame is located inside and outside the electromagnetic coil.

The magnetic energy body is composed of a first magnetic energy body that is movably arranged inside the casing and is in contact with the object-carrying mechanism and the second magnetic energy body, and a second magnetic energy body that is fixedly arranged below the inside of the casing, wherein: the first magnetic energy body The body is a cylindrical structure, and the second magnetic energy body is a direction-abnormal structure.

A reset elastic body is arranged between the first magnetic energy body and the inside of the housing.

The electromagnetic coil is one or more electromagnetic solenoids, which are specifically located in the casing and arranged outside the second magnetic energy body.

The object-carrying mechanism includes: an object stage, a structural sensor, a displacement output plate and a displacement output rod body which are fixedly connected sequentially from top to bottom, wherein: the displacement output rod body is movably connected with the housing and its lower end is in contact with the magnetic energy body.

The loading mechanism is provided with a guide shaft, which is located on the lower surface of the displacement output disk and is movably connected with the housing to realize guidance.

In the initial working state of the vibrating table of the present invention, before the electromagnetic excitation signal is passed through, the magnetic energy body is constrained in the horizontal direction by the pressure of the elastic body through the action of the elastic body, and the magnetic pole is in the horizontal direction at this time. When working, electrify the electromagnetic coil, because the direction of the electromagnetic field is perpendicular to the direction of the magnetic pole of the initial magnetic energy body, when the electromagnetic field strength is sufficient, the magnetic energy body will undergo magnetic pole deflection, and the length direction of the magnetic energy body will also change from the horizontal direction to the vertical direction with the magnetic pole deflection , the magnetic energy body is deflected to the vertical direction, so that while overcoming the restoring elastic constraint force, it rotates against the counter-rotating bearing and at the same time pushes the displacement output rod to move upwards, and then pushes the displacement output plate and the structural sensor to finally drive the stage and The test piece to be placed on it moves upwards. The moving distance is proportional to the electromagnetic field intensity or the applied current intensity, and can be controlled by applying current. The maximum displacement is the distance from the center of the direction-shaped magnetic energy body to the apex of the end in the direction of the magnetic pole and the distance to the apex of the end in the direction perpendicular to the direction of the magnetic pole. difference. When the displacement output rod is jacked up, the current is cut off or the reverse current is applied, then the magnetic energy body will turn to the horizontal position under the action of the recovery pressure of the recovery elastic body, or the combined force of the recovery pressure of the recovery elastic body and the reverse electromagnetic force , so that the displacement output rod body and then the stage and the test piece on it will fall back. In this way, when the current is applied to or cut off the electromagnetic coil, the device of the present invention will change the current in the forward and reverse directions as the electromagnetic coil is applied, and the test piece on the stage realizes a process of reciprocating up and down. Based on this, if the coil is repeatedly switched on and off or switched on with an alternating current, then the vibrating table of the present invention will realize the process of reciprocating vibration up and down. Both the amplitude and frequency of the vibration can be correspondingly controlled by the strength and frequency of the applied current signal.

In the vibrating table of the present invention, a tension-compression structure sensor with sufficient connection strength is provided between the loading platform and the displacement output disk. When the loading platform pushes the test piece up and pulls it back down, the displacement output disk transmits it to the test piece. The pushing and pulling forces can be sensed in real time by the same amount of structural sensors. Therefore, the vibrating table of the present invention can not only realize the effect of the vibrating table, but also the driving force and driving acceleration or driving flat rate applied to the test piece during the vibration process can be detected in real time, thereby finally realizing the force-controlled electromagnetic permanent magnet Compound excitation shaker.

The present invention relates to a force-controlled electromagnetic permanent magnet composite excitation vibration system. The above-mentioned several force-controlled electromagnetic permanent magnet composite excitation vibration tables are arranged in a linear array, a plane array or a three-dimensional array and their electromagnetic coils are connected in parallel or in series. composition. The system can be used to simulate the anti-vibration and anti-external load test work of large facilities with long "length" such as bridges, and to simulate the impact on vehicles and large buildings such as road surfaces, waves, earthquakes, etc. Anti-vibration, anti-external load experimental test research or used to simulate the realization of three-dimensional external load impact, vibration and force on vehicles and large buildings.

Compared with the prior art, the present invention has the following advantages:

1. Realize the direct vibration drive based on the combined magnetic energy of electromagnetic and magnetic energy bodies, with high drive efficiency and energy saving;

2. The vibration motion is directly driven, the mechanism is simple, the rigidity is good, and the reliability is good;

3. The driving vibration frequency can be completely controlled by an external electrical signal, which can realize broadband vibration from quasi-static to high frequency;

4. It is easy to realize large amplitude driving; it is also easy to realize small amplitude; the vibration displacement is accurate and controllable;

5. The stretching stress, strain size and precision can be controlled by precisely applying the intensity of the magnetic field or current, and the control is simple and convenient;

6. With the structural sensing link, the driving force, acceleration, displacement, etc. applied to the tested part during the vibration driving process can be monitored or converted, so as to facilitate the realization of closed-loop control of vibration testing.

Description of drawings

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

Among them: (a) is a schematic diagram of no pressure state, (b) is a schematic diagram of pressure state.

Fig. 2 is the schematic diagram of embodiment force control type electromagnetic permanent magnet composite excitation vibration system;

Among them: (a) is a linear array, (b) is a planar array, and (c) is a three-dimensional array.

Detailed ways

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

Example 1

As shown in Figure 1, this embodiment includes: a housing 1, an electromagnetic coil 2, magnetic energy bodies 3, 4 and an object-carrying mechanism 5, wherein: two magnetic energy bodies 3, 4 are respectively arranged up and down on the housing 1 in the form of horizontal shafts Inside and in contact with each other, the electromagnetic coil 2 is located inside the housing and facing the second magnetic energy body 4, and the loading mechanism 5 is movably arranged on the top of the housing 1 and is in contact with a magnetic energy body.

The housing 1 includes: a base 6, a rotating shaft support frame 7, a magnetic circuit inner frame 8 and a fuselage outer frame 9, wherein: the fuselage outer frame 9 is fixedly connected to the base 6, the rotating shaft support frame 7 and the magnetic circuit The inner frame body 8 is respectively fixed in the outer frame body 9 of the fuselage and located inside and outside the electromagnetic coil 2 .

The inside of the outer frame body 9 of the fuselage and the inner frame body 8 of the magnetic circuit are filled with a cooling medium 10;

The magnetic energy body is composed of a first magnetic energy body 3 that is movably arranged inside the housing 1 and is in contact with the object-carrying mechanism 5 and the second magnetic energy body 4, and a second magnetic energy body 4 that is fixedly arranged below the inside of the housing 1. , wherein: the first magnetic energy body 3 is a cylindrical structure, and the second magnetic energy body 4 is an elliptical cylindrical structure.

A return spring 11 is provided between the primary magnetic energy body 3 and the inside of the housing 1 .

The electromagnetic coil 2 is one or more electromagnetic solenoids, which are specifically located in the housing and arranged on the outside of the second magnetic energy body 4. When the electromagnetic coil 2 is an electromagnetic solenoid, the magnetic energy body 4 is placed on it. Central position; when the electromagnetic coil 2 is more than two electromagnetic solenoids, it is uniformly arranged on the outside of the second magnetic energy body 4 .

The loading mechanism 5 includes: a loading platform 12 fixedly connected sequentially from top to bottom, a structural sensor 13, a displacement output disc 14 and a displacement output rod body 15, wherein: the displacement output rod body 15 is movably connected with the housing 1 and its The lower end is in contact with the magnetic energy body.

A linear bearing 16 is provided between the displacement output rod and the housing 1 .

The structure sensor 13 is a piezoelectric force sensor.

The loading mechanism 5 is provided with a guide shaft 17, the guide shaft 17 is located on the lower surface of the displacement output disk 14 and is movably connected with the housing 1 to realize the guide.

A linear bearing 16 is provided between the guide shaft 17 and the housing 1 .

In the initial working state of the device, before the electromagnetic excitation signal is passed through, the reset elastic body acts as the return spring 11, and the magnetic energy body is a permanent magnet and its outsourcing base 6 is constrained in the horizontal direction by the reset elastic body as the return spring 11. At this time, the magnetic poles of the permanent magnet are in the horizontal direction. When working, the electromagnetic coil 2 is energized, because the direction of the electromagnetic field generated by it is perpendicular to the direction of the initial permanent magnet magnetic pole, when the electromagnetic field strength is sufficient, the permanent magnet will undergo magnetic pole deflection, and the length direction of the permanent magnet will also change from the horizontal direction to the horizontal direction along with the magnetic pole deflection. When the vertical direction changes, the permanent magnet deflects to the vertical direction, so that while overcoming the binding force of the return spring 11, the displacement output rod body 15 moves upwards while resisting the rotation of the counter-rotating bearing, thereby pushing the displacement output disc 14 and the structure The sensor 13 finally drives the stage 12 and the test piece to be placed on it to move upward, as shown by the dotted line in the figure.

The moving distance is proportional to the electromagnetic field strength or the applied current strength, and can be controlled by applying current. The maximum displacement is the distance from the center of the elliptical cylindrical permanent magnet with a different direction in the second magnetic energy body to the apex of the end in the direction of the magnetic pole and the sum of the magnetic poles. The distance difference between the end vertices in the direction perpendicular to the direction. After the displacement output rod body 15 is jacked up, the current is cut off or the reverse current is applied, then the permanent magnet will be rotated under the return pressure of the return spring 11, or the combined force of the return pressure of the return spring 11 and the reverse electromagnetic force until Horizontal position, so that the output rod body 15 is displaced so that the stage 12 and the test pieces thereon will fall back. During the whole driving process, the movement of the displacement output rod body 15 and the movement of the displacement output disk 14 are guided by the linear bearing 16, the guide shaft 17 and the linear bearing 16 arranged on the outer frame body 9 of the fuselage, so that the driving vibration movement is more stable . In addition, the outer side of the guide shaft 17 between the displacement output disk 14 and the upper end cover of the outer frame body of the fuselage is wrapped with a rubber supporting elastic body 18, which can play a role in buffering the displacement output rod body 15 when the stage 12 falls back. Another convenience is that the impact of the magnet can share the ability of the displacement output rod body 15 to carry the load to be tested, so that the displacement output rod body 15 can drive a test piece with a larger mass. In addition, during the working process of the vibrating table, the gap between the outer frame body of the fuselage and the inner frame body 8 of the magnetic circuit can be filled with a phase-change cooling medium 10 such as paraffin wax to prevent the electromagnetic coil 2 from heating.

In this way, according to the above description, as the current is applied to the electromagnetic coil 2 or the power is cut off, the device will change the current in the positive and negative directions as the electromagnetic coil 2 is applied, and the test piece on the stage 12 realizes a process of reciprocating up and down. Based on this, if the electromagnetic coil 2 is repeatedly switched on and off or switched on with an alternating current, the device will realize the process of reciprocating vibration up and down. Both the amplitude and frequency of the vibration can be correspondingly controlled by the strength and frequency of the applied current signal.

At the same time, the vibrating table of this device is provided with a tension and pressure structure sensor 13 with sufficient connection strength between the loading table 12 and the displacement output disk 14, which is a piezoelectric force sensor. When the loading table 12 pushes the test piece to lift, it will pull back and fall. When the displacement output disc 14 is transmitted to the test piece, the pushing force and the pulling force can be sensed by the pressure sensor in real time. Therefore, the vibration table of this device can not only realize the function of the vibration table, but also the driving force, driving acceleration or driving frequency applied to the test piece during the vibration process can be detected in real time or obtained through conversion, so as to finally realize the force-controlled electromagnetic Permanent magnet compound excitation vibration table.

Example 2

As shown in Figure 2, this embodiment excites the corresponding driven body or driven body by arranging the above-mentioned several force-controlled electromagnetic permanent magnet composite excitation vibration tables 19 in a linear array, a planar array or a three-dimensional array. Array 20, and independently control or connect or connect its electromagnetic coils in series to form a corresponding force-controlled electromagnetic permanent magnet composite excitation vibration system, which can be used to simulate and realize anti-vibration and anti-vibration for large-scale facilities such as bridges with a long "length". External load experimental test work, used to simulate the anti-vibration and external load experimental test research on the impact of vehicles and large buildings such as road surfaces, waves, earthquakes, etc. or used to simulate the three-dimensional impact of vehicles and large buildings Experimental research on anti-external force, anti-vibration, and anti-external load under the action of external load shock, vibration and force.

Claims (10)

1. electromagnetic permanent magnet combined excited vibration platform of power control type, comprise: housing, solenoid, magnetic energy body and loading mechanism, it is characterized in that: two magnetic energy bodies respectively with horizontal rotating shaft mode upper and lower settings in enclosure interior and be in contact with one another, solenoid is positioned at enclosure interior and over against the second magnetic energy body, loading mechanism is movably set in the top of housing and contacts with a magnetic energy body.

2. the electromagnetic permanent magnet combined excited vibration platform of power control type according to claim 1, it is characterized in that, described housing comprises: the outer framework of base, rotating shaft support frame, magnetic circuit internal frame body and fuselage, wherein: the outer framework of fuselage is fixedlyed connected with base, and rotating shaft support frame and magnetic circuit internal frame body are fixedly set in the outer framework of fuselage respectively and are positioned at the inside and outside of solenoid.

3. the electromagnetic permanent magnet combined excited vibration platform of power control type according to claim 1, it is characterized in that, described magnetic energy body is by being movably set in enclosure interior and forming with loading mechanism and the contacted first magnetic energy body of the second magnetic energy body and the second magnetic energy body that is fixedly set in enclosure interior below respectively, wherein: the first magnetic energy body is a cylindrical structural, and the second magnetic energy body is the direction polymorphic structure.

4. the electromagnetic permanent magnet combined excited vibration platform of power control type according to claim 3 is characterized in that, described first time is provided with the Flexible Reset parts between magnetic energy body and the enclosure interior.

5. the electromagnetic permanent magnet combined excited vibration platform of power control type according to claim 1 and 2 is characterized in that described solenoid is one or more os, specifically is positioned at housing and is arranged at the outside of the second magnetic energy body.

6. the electromagnetic permanent magnet combined excited vibration platform of power control type according to claim 1, it is characterized in that, described loading mechanism comprises: the objective table that from top to bottom is fixedly connected sequentially, structure sensor, displacement output panel and the displacement output body of rod, wherein: the displacement output body of rod contacts with the magnetic energy body with housing flexible connection and its lower end.

7. the electromagnetic permanent magnet combined excited vibration platform of power control type according to claim 1 is characterized in that, is provided with linear bearing between described displacement take-off lever and the housing.

8. the electromagnetic permanent magnet combined excited vibration platform of power control type according to claim 1 is characterized in that, described loading mechanism is provided with the axis of guide, and this axis of guide specifically is positioned at the lower surface of displacement output panel and flexibly connects with housing, realizes guiding.

9. the electromagnetic permanent magnet combined excited vibration platform of power control type according to claim 1 is characterized in that, is provided with linear bearing between the described axis of guide and the housing.

10. the electromagnetic permanent magnet combined excited vibration of power control type system is characterized in that being arranged with linear array formula, planar array formula or 3 D stereo array and in parallel or its solenoid of connecting is formed by the electromagnetic permanent magnet combined excited vibration platform of several the above-mentioned described power control of arbitrary claim types.

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