Some knowledge points of ultrasonic sewing machine

Ultrasonic sewing machine, also known as ultrasonic lace machine, works by using high-frequency oscillation to transmit sound waves to the welding surface of the workpiece through the welding head, instantly causing friction between the molecules of the workpiece and completing the welding. Its joint strength is close to that of a whole continuous material, which can meet the functional requirements of waterproof, sealing, and antibacterial welding products.

Ultrasonic spindle machines and sewing machines are basically the same in terms of product structure design and operation, except that ultrasonic spindle machines abandon traditional sewing steps and replace them with ultrasonic welding, making the operation simpler.

The dual motor ultrasonic sewing machine does not require needles and wires, saving costs and avoiding the trouble of broken needles and wires. It directly performs straight and curved welding processing, bonding fabrics, and simultaneously performs trimming and printing to form the product in one go. Due to its excellent waterproof, sealing, and antibacterial properties, it has become the choice for making disposable surgical gowns and other medical supplies.

Some substances, such as time sensitive materials and piezoelectric ceramics, not only change their geometric dimensions when subjected to external forces, but also undergo internal polarization, resulting in the formation of an electric field on the surface due to the appearance of charges; After the external force disappears, the material returns to its original state. This phenomenon is called piezoelectric effect. On the contrary, if these materials are placed in an electric field, their geometric dimensions will also change. The phenomenon of mechanical deformation of materials caused by external electric fields is called the inverse piezoelectric effect. Ultrasonic processing and ultrasonic lace machine are both applications of the inverse piezoelectric effect.

The ultrasonic transducer system consists of an ultrasonic transducer, a variable amplitude rod, and a tool variable amplitude rod. When 220V and 50Hz AC currents enter the ultrasonic generator, the generator starts working, converting the 50Hz frequency to 20000Hz and maintaining it at this frequency. The 20000Hz current output by the ultrasonic generator flows into the transducer, which converts electrical energy into mechanical energy and generates ultrasonic mechanical vibration perpendicular to its upper surface. Its amplitude is only 0.005-0.01mm, and then amplified to 0.05-0.1mm by the amplitude lever and tool amplitude lever, driving the tool end face for ultrasonic vibration. There is a flower wheel above the tool horn. When the fabric is pressed between the flower wheel and the tool horn end face, the temperature at the contact point rises sharply due to friction between the contact surface and molecules, resulting in cutting (at the edge of the flower wheel) and perforation (in the middle of the flower wheel)

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