28Kh Ultrasonic Piezoelectric Electric Converter for Ultrasound
Portable Riveting Machine
Description:
The ultrasonic transducer can generate regular vibration under the
excitation of a suitable electric field, and its amplitude is
generally about 10 μm. Such amplitude is not enough to directly
complete the welding and processing steps. Therefore, the
transducer links a properly designed ultrasonic horn, and the
amplitude of the ultrasonic wave can be varied within a wide range,
as long as the material strength is sufficient, the amplitude can
exceed 100 μm.
The transducer converts the ultrasonic frequency voltage from the
generator into ultrasonic mechanical vibration of the same
frequency by an inverse piezoelectric effect. It consists of a
number of piezoceramic sheets sandwiched between two metal (usually
titanium) blocks. A thin metal plate is formed between the sheet
and the sheet to form an electrode. When a sinusoidal electrical
signal is supplied to the transducer via the electrodes, the
piezoelectric sheet expands and contracts, producing an axial
peak-to-peak motion of 15-201 xm. The transducer is a precision
device and should be handled with care.
Specifications:
| Model | QR-3028-4FZ |
| Frequency | 28khz |
| Output power | 700 watt |
| Joint bolt | M8*1 |
| Ceramic disc Diameter | 30mm |
| Qty of ceramic discs | 4pcs |
| Capacitance | 6-7nf |
| Amplitude | 8 um |
| Application | Plastic welding machine |
Ultrasonic technology:
In ultrasonic welding, it is common for the surface of the product
to be scratched, broken or cracked at the joint. Because there are
two situations in ultrasonic operation: 1. High thermal energy
directly contacts the surface of the plastic product 2. Vibration
conduction. Therefore, when ultrasonic vibration is applied to
plastic products, the surface of the product is prone to burns, and
plastic columns or holes with a thin thickness of 1 m/m are also
prone to cracking. This is a prerequisite for ultrasonic operation.
Avoided. On the other hand, due to the lack of ultrasonic output
energy (extension table and HORN upper mold), it takes a long time
to weld when the vibration friction energy is converted into heat
energy to accumulate thermal energy to compensate for the lack of
output power. This kind of welding method is not the vibration
friction heat energy that is achieved in an instant, but the
welding time is required to accumulate the heat energy, so that the
melting point of the plastic product reaches the welding effect, so
that the heat energy stays on the surface of the product for too
long, and the accumulated temperature And stress will also cause
burns, breaks or breaks in the product. At this time, it is
necessary to consider the power output (number of segments),
welding time, dynamic pressure and other factors to overcome this
type of job loss.
Solution:
1. Reduce the pressure.
2. Reduce the delay time (early vibration)).
3. Reduce the welding time.
4. Quote media coverage (eg PE bags).
5. The mold has a surface treatment (hardened or chrome plated).
6. The number of machine stages is reduced or reduced.
7. For products that are easily cracked or broken, the fixture
should be made into a buffer, such as soft resin or covered cork
(this means does not affect the welding strength).
8. Easy to break products add R angle at right angles.
28Kh Ultrasonic Piezoelectric Electric Converter for Ultrasound
Portable Riveting Machine
