Summary of the invention
Technical problem to be solved by this invention provides the ultrasonic scarifier of a kind of reasonable in design, applied widely, energy-saving and environmental protecting, its characteristics are, comprise ultrasonic signal generator 1, transducer 2, oscillating plate 3, wherein, ultrasonic signal generator 1 and transducer 2 connect by lead, and transducer 2 links to each other with oscillating plate 3.
Another object of the present invention provides a kind of ultrasonic scarifying method, may further comprise the steps: earlier oscillating plate 3 is installed on the soil of underwater, start ultrasonic signal generator 1, produce high-frequency signal and give transducer 2, transducer 2 converts high-frequency signal to ultrasonic vibration, make oscillating plate 3 promote water and make ultrasonic vibration, the water generates cavitation phenomenon in the soil and soil is fluffed reaches the effect of loosening the soil.
Aforesaid ultrasonic vibration plate is that one deck has certain thickness corrosion resistant plate, transducer is bonded on the oscillating plate, by the certain frequency of supersonic generator generation and the ac signal of voltage, drive transducer and oscillating plate and do dither together, when oscillating plate upwards vibrates, water is upwards pushed open, when oscillating plate vibrates downwards, water does not catch up with the vibration velocity of oscillating plate, between water and oscillating plate, can form a space, vibration just has many bubble formation so repeatedly, this bubble is produced by " cavitation effect ", and we are referred to as cavitation bubble, and cavitation bubble can be along direction of vibration to water transmission, cavitation bubble produces thousands of atmospheric impacts after striking aqueous soil, thus the purpose that realization is loosened the soil.
Operation principle of the present invention is as follows: because hyperacoustic wavelength is short, so ultrasonic is near-sighted straightline propagation in aqueous soil, produce reflection, refraction at interface, cause the vibration vortex of irregular movement, aqueous soil is played agitaion, and the water particle liquid internal can produce sound cavitation effect and acoustic streaming effect in soil simultaneously.Sound cavitation effect is meant: when ultrasonic is propagated in aqueous soil, because ultrasonic frequency height, power are big, fluid molecule is subjected to the periodically effect of alternation sound field, that the density that causes liquid changes is fast, the difference of density greatly, this density changes, when making aqueous soil and tension, the time and pressurized produces negative pressure in liquid, sound wave sparse mutually in, liquid is subjected to tension, if sound pressure level is enough big, then liquid is produced cavitation bubble or hole by drawing crack.Low density gas or steam abrim in this moment emptying aperture, form cavitation nucleus, in aqueous soil, always have a certain amount of microbubble usually, but be not that all microvesicles in the aqueous soil can both become the cavitation complex, have only when the acoustic pressure in the liquid surpasses certain threshold value, cavitation bubble could form.Under the vibration effect of sound field, when acoustic pressure reaches certain value, bubble will expand rapidly, the sound wave malleation of arriving subsequently mutually in, these cavitation bubbles or hole will be with high speed closure or collapses, when closed high and pressurized, but the tension of aqueous soil is very poor, and aqueous soil will rupture, produce the little hole that some are close to vacuum, then liquid is compressed, and these holes are compressed to collapse, in the collapse process, inside, hole reaches several thousand atmospheric pressure, continuously produce instantaneous pressure and resemble a succession of little " blast " and constantly impact soil inside, soil is fluffed, thereby reach the purpose on the ground that loosens the soil.
When high-energy ultrasonic was propagated in aqueous soil, because of the interaction of viscous force in sound wave and the aqueous soil, the finite amplitude decay made in the aqueous soil and begins to form certain acoustic pressure gradient from sound source, caused flowing of aqueous soil to be the acoustic streaming effect.Aqueous soil middle distance sound source is far away more, and the equivalent force that the finite amplitude acoustic streaming causes is more little.The acceleration of the acoustic streaming that high-energy ultrasonic causes in aqueous soil is big, and makes acoustic streaming with bigger speed motion, can reach 10~10 of fluid thermal convection velocity
3Doubly.Stirring, dispersion, degasification, impact failure, effect and aqueous soil in the mechanics effect that acoustic cavitation and acoustic streaming the are caused reason of loosening the soil.
The present invention has compared following advantage and effect with prior art: 1, ultrasonic loosens the soil, and it is fast to have the speed of loosening the soil, the good effectiveness of loosening the soil.2, energy savings, weeds have dehydration in 3 pairs of soil, make weeds death, and herbicide effect is arranged.
Below in conjunction with embodiment the present invention is further described in detail, following examples are explanation of the invention but the present invention is not limited to following examples.
Embodiment
As shown in Figure 1, ultrasonic scarifier of the present invention comprises ultrasonic signal generator 1, transducer 2, oscillating plate 3, and wherein, oscillating plate 3 is installed on the soil of underwater, ultrasonic signal generator 1 and transducer 2 connect by lead, and transducer 2 links to each other with oscillating plate 3.
During work, earlier with ultrasonic signal generator 1 power supply opening, make transducer 2 produce ultrasonic vibration, carry out ultrasonic vibration by 3 pairs of water and soil earth of oscillating plate, soil is produced cavitation effect, under the vibration effect of sound field, when acoustic pressure reaches certain value, bubble will expand rapidly, the sound wave malleation of arriving subsequently mutually in, these cavitation bubbles or hole will the closed or collapses with high speed, when closed high and pressurized, but the tension of aqueous soil is very poor, aqueous soil will rupture, and produces the little hole that some are close to vacuum, and then liquid is compressed, these holes are compressed to collapse, in the collapse process, inside, hole reaches several thousand atmospheric pressure, continuously produces instantaneous pressure and resembles a succession of little " blast " and constantly impact soil inside, soil is fluffed, thereby reach the purpose on the ground that loosens the soil.