With the continuous development of science and technology, more and more new materials are widely used in industrial production, among which plastic material, as a widely used material, its processing and connection methods are becoming more and more important.The traditional welding method of plastic pepper balls often requires high temperature and high pressure, which will not only pollute the environment, but also damage the plastic materials.Therefore, ultrasonic plastic pepper ball welding machine came into being.This paper will introduce the principle and application of ultrasonic plastic pepper ball welding machine.Ultrasonic plastic pepper ball welding machine is a kind of machine which uses ultrasonic vibration to heat and melt plastic materials and weld two or more plastic parts together.Its main components include ultrasonic vibration device, workbench, welding head, control system and so on.Ultrasonic vibration device is a part of ultrasonic plastic welding machine, which consists of generator, transducer and vibration die.The generator is the source of ultrasonic vibration, which converts electric energy into high-frequency mechanical vibration and then transmits it to the transducer.Transducer is a device that converts electrical energy into mechanical vibration. It converts high-frequency electrical energy into high-frequency mechanical vibration and transmits it to the vibration mold.Vibrating die is a component that transmits ultrasonic vibration to plastic materials. It consists of a welding head and a fixture. The fixture tightly fixes the plastic parts, and the welding head transmits ultrasonic vibration to the plastic materials.The working principle of ultrasonic plastic welding machine is to increase the molecular thermal motion of plastic materials by using ultrasonic vibration, so as to achieve the purpose of heating and melting.When ultrasonic vibration is transmitted to the contact surface of plastic material, it will cause high-frequency friction and vibration on the surface of plastic material, thus increasing the friction between molecules and enhancing the thermal movement of molecules, so as to achieve the purpose of heating and melting.When the contact surfaces of two or more plastic parts are subjected to ultrasonic vibration, they will melt and fuse together to form a whole.Ultrasonic plastic pepper ball welding machine has many advantages.First of all, it can complete the welding work in a low-temperature, low-pressure and pollution-free environment, which will not cause damage to plastic materials and pollution to the environment.Secondly, the ultrasonic plastic pepper ball welding machine can finish the welding of plastic parts quickly and efficiently, saving time and cost.In addition, it can also weld plastic parts of various shapes and sizes, and has wide applicability.In a word, ultrasonic plastic pepper ball welding machine is a kind of plastic welding equipment with high efficiency, environmental protection and wide applicability.Its principle is to increase the molecular thermal motion of plastic materials by using ultrasonic vibration to achieve the purpose of heating and melting.