Views:37 Author:Site Editor Publish Time: 2019-09-05 Origin:Site
The ultrasonic horn is also called the ultrasonic shift lever and the ultrasonic concentrator. In ultrasonic technology, it is especially important in the vibration system of high sound intensity ultrasonic equipment.
The function of the ultrasonic horn is to amplify the displacement or velocity of the mechanical vibration, or to concentrate the ultrasonic energy on a small area, that is, the energy gathering. We know that the vibration amplitude of the radiating surface of the ultrasonic transducer is only a few microns in the range of 20 kH. In high-acoustic and strong-sound applications, such as ultrasonic machining, ultrasonic welding, ultrasonic metal forming (including ultrasonic cold-drawn tube flying wire and riveting, etc.) and some ultrasonic surgical equipment and ultrasonic fatigue test applications, the vibration amplitude of the radiating surface is generally It takes tens to hundreds of microns. Therefore, the ultrasonic horn must be connected to the end face of the transducer to amplify the mechanical vibration amplitude. In addition, the ultrasonic horn can also act as a mechanical impedance converter for impedance matching between the transducer and the acoustic load to allow ultrasonic energy to be efficiently transmitted from the transducer to the load.
Ultrasonic horn performance can be described by a number of parameters. Commonly used in practical applications are: resonance frequency (resonance length), amplification factor, form factor, input force impedance, and bending stiffness. The amplification factor refers to the ratio of the particle displacement or the velocity amplitude of the output end and the input end when the horn operates at the resonance frequency; the shape factor is one of the indicators for measuring the vibration speed of the horn, which is only related to the geometry of the horn. The shape is related, and the larger the value, the greater the vibration speed that can be achieved. The input force impedance defines the complex ratio of the input end force to the particle vibration speed. In practical applications, it is often required that the input force impedance be small with changes in frequency and load. Bending stiffness is the reciprocal of bending compliance. The longer the horn, the greater the flexibility of the rib, which is a must be avoided in many practical applications. The bending stiffness is also related to the geometry of the horn.
How to install and disassemble the ultrasonic horn？
1. Install the horn
Place the transducer on the table, hold the wrench ① in the left hand to the aluminum alloy part of the main transducer, and hold the wrench ② in the right hand to clamp the horn part of the transducer. The left hand is forced clockwise and the right hand is counterclockwise. If the installation is tight, the transducer can be placed vertically and the horn can be clamped and fixed by clamps (softer gasket can be used to protect the surface of the horn when clamping), and the transducer is clamped with the wrench ③. The aluminum part is tightened clockwise.
2. Disassemble the horn
Put the transducer upside down on the table, hold the wrench ④ in the left hand to clamp the aluminum alloy part of the transducer, and hold the wrench ⑤ in the right hand to clamp the horn part of the transducer. The left hand is forced clockwise, and the right hand is forced counterclockwise; If the sensor is not disassembled, the transducer can be placed vertically and vertically, and the horn can be clamped and fixed by clamps (the softer gasket can be used to protect the surface of the horn when clamping), and the aluminum alloy of the transducer is clamped with the wrench ⑥. Part, loosen counterclockwise.