CN2107955U - Push-pull vibration exciter - Google Patents

Abstract

The utility model discloses a push-pull vibration exciter using rare earth material. An alternating current power supply with adjustable frequencies and pulse widths is supplied in a coil which is wound on a U-shaped iron core, a vibrator made of rare earth permanent magnet material, which acts as an armature, is arranged above the coil, and a tension spring is fixedly mounted below the center of the vibrator, so that the vibrator can compress or stretch the spring to reciprocate under the attraction or the repulsion of the alternating magnetic field of an electromagnet. The device which is a controllable vibration source for electromagnetic excitation has the advantages of simple structure, stable and reliable operation, and reduced energy consumption, and enables equipment to run under the optimal working condition, being a new vibration source for mechanical vibration equipment.

Description

Push-pull vibration exciter

The utility model relates to a kind of push-pull vibration exciter that adopts rare earth permanent-magnetic material to make, and belongs to machine driving parts technical field.

Adopt vibration in many fields of national economy or industry, all can meet for the plant equipment of groundwork mode, for example, in the oil field, drilling operation scene, mine, the mud vibrating screen of be used to purify mud, removing drilling cuttings; In the construction site, be used to hit tight the vibro-rammer (being commonly called as " a kind of ramming machine ") on ground or road surface and other oscillating column pumps, oscillator or the like, these vibratory equipments mostly adopt machine driving, promptly by motor-driven deceleration device (gear-box or belt pulley transmission are paid), drive the rotating shaft rotation that eccentric cam is housed again, produce the double vibrations of certain orientation thus.This mechanical vibrator, complex structure, drive disk assembly is many, and parts depreciation is fast, and service life is short.Moreover therefore traditional mechanical vibration equipment also just can not be vibrated the natural resonance frequency work that the operating point is transferred to this equipment just to it because its vibration frequency can not control at random.In order to guarantee that equipment can steady operation, just must make its operating frequency be higher than the intrinsic resonant frequency of equipment far away, have in addition differ surplus the several times, ten times and even tens of times.Owing to the mechanical vibration source far off resonance point work that adds, the energy of most of input just all is not utilized effectively like this, and quilt loss has in vain been wasted.And if the resonance point that makes equipment be in himself vibrates, just can satisfy the needs that equipment keeps vibration as long as replenish very little energy so to vibration source.

The purpose of this utility model is mechanical equipment vibration the source----push-pull vibration exciter that a kind of electromagnetic exciting will be provided, to solve the above-mentioned defective that prior art exists.

Structure of the present utility model is as shown in Figure 1: it include iron core 1, coil 2, oscillator 3 and and tension spring 4 four parts, feed frequency in the coil 2 that is characterized on U sections core 1 twining, AC power that pulsewidth is adjustable magnetizes, and be equivalent to armature, the oscillator 3 made with rare earth permanent-magnetic material is the Jiong type, be positioned at the top of solenoid iron core 1, the central authorities below of oscillator 3 is fixed with a tension spring 4, make oscillator under the alternating magnetic field attraction or repulsion of electromagnet, compression or extension spring are reciprocating.

Operation principle of the present utility model is referring to Fig. 2: feed the AC power that frequency, pulsewidth can be adjusted at random in coil 2, will make the electromagnet that constitutes by coil 2 and iron core 1 produce alternating magnetic field and magnetic pole, and attraction or repulsion are positioned at the iron core top, the oscillator that is equivalent to armature moves back and forth, and make and vibrator integrated device produces vibration.Because oscillator 3 is hard magnetic bodies made from rare earth permanent-magnetic materials such as neodymium iron borons, the back magnetic energy product density that magnetizes is big, and coercivity is high, almost can forever keep its magnetic, even long-term work can not demagnetized in alternating magnetic field yet, this is the place of the material key that can achieve success of the utility model just.As for iron core must select then that magnetic capacity is big for use, remanent magnetism and coercivity be little, easy magnetization and degaussing, and the little soft magnetic materials manufacturing of magnetic hystersis loss, for example cold-reduced silicon sheet, iron-nickel alloy (glass is alloy not) etc. are to reduce the magnetic hystersis loss that the alternating source remagnetization causes.

When feeding forward current in the coil, the polarity of the magnetic field that U sections core produces is opposite with the polarity of permanent magnet oscillator just, because the cause that the magnetic field heteropolarity attracts mutually, oscillator is attracted to pull to iron core by electromagnetic attraction; But the spring that this moment, oscillator below installed is compressed, and along with the compressed displacement of tension spring increases, the restorable reverse elastic force that spring produces also increases thereupon, and up to itself and electromagnetic attraction balance, oscillator then produces downward displacement S1 (as Fig. 2 A).In like manner, when feeding reversing the current in the coil, oscillator just produces reverse displacement S2 (as Fig. 2 B) upwards.In cycle, the displacement total amount (amplitude) of oscillator is exactly Δ S1+ Δ S2 at an alternating current.So to iron-core coil feedback with AC power, oscillator will produce ceaselessly double vibrations.

The utility model also is rapidly and the day by day product of practical Power Electronic Technique of contemporary development, it utilizes the motive power of frequency conversion voltage adjusting AC power as exciting, be aided with output pulses electronic circuit and related device as Drive and Control Circuit of the present invention, device, with regard to can be used as that executing agency is widely used in various mechanical vibration equipments and the prime mover and the transmission device that replace traditional mechanical oscillation.As long as supply frequency, pulsewidth, the polarity of feed in winding are controlled, just can be to the duty random optimization control of electromagnetic exciting of the present utility model, therefore, it is a kind of controlled vibration source, the resonant condition that can make vibration reach equipment itself produces resonance, optimizes operating mode work thereby significantly reduce energy resource consumption and be in.And, because frame for movement is simplified greatly, there are not machine driving and consequent wearing and tearing, the device reliable and stable work, maintenance work is also minimized.In a word, the utility model is a kind of new vibration source with mechanical vibrator of update meaning, make traditional mechanical oscillation change electromagnetic exciting into, and then can realize variable working condition optimal control at random, the condition that various vibratory equipments is had be included into unified coordination and administration in the electromechanical integration control system and may.It will be to the increasing impetus of industrial technological progress performance.

Claims (3)

1, a kind of push-pull vibration exciter that adopts the rare-earth magnet material, include iron core 1, coil 2, oscillator 3 and and tension spring 4 four parts, feed frequency in the coil 2 that it is characterized in that on U sections core 1 twining, AC power that pulsewidth is adjustable magnetizes, and be equivalent to armature, the oscillator made from rare earth permanent-magnetic material 3 is the Jiong type, be positioned at the top of solenoid iron core 1, the central authorities below of oscillator 3 is fixed with a tension spring 4, make oscillator under the alternating magnetic field attraction or repulsion of electromagnet, compression or extension spring are reciprocating.

2, push-pull vibration exciter as claimed in claim 1, it is big to it is characterized in that iron core is used magnetic capacity, the manufacturing of cold-reduced silicon sheet that coercivity is little or iron-nickel alloy (glass is alloy not) material.

3, push-pull vibration exciter as claimed in claim 1 is characterized in that the high rare earth permanent-magnetic material manufacturing of oscillator application coercivity, as neodymium iron boron.

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