With the rapid development of China's economy, China has gradually become the world's processing center, and at the same time, China's machinery products are also developing rapidly.
The following motor manufacturers talk about the application of stepper motor in filling and sealing machine.
Filling and sealing machine has a wide range of applications in cosmetics, light industry (daily chemical), pharmaceutical, food and other industries. These industry products generally choose hoses as packaging containers, the equipment can fill the inside of the hose with ointment, cream, gels or viscous fluids, and then combine the hot melt printing code at the end of the hose, and trim and shape at the same time to produce finished products.
First, the working principle of stepper motor
A stepper motor is an open-loop control element that converts a given electrical pulse signal into angular or linear displacement.
Given an electrical impulse signal, the stepper motor rotor turns the corresponding angle. Due to the linear relationship between the electrical pulse signal and the rotation angle of the stepper motor, the stepper motor has been widely used in high-precision positioning.
The speed control of the stepper motor is realized by the speed of the input pulse frequency. When the frequency of the pulse decreases, the speed of the stepper motor decreases; When the frequency increases, the speed increases.
In packaging machinery, using stepper motors to drive actuators can not only make the structure of packaging machinery simple, easy to adjust, increase reliability, but also greatly improve accuracy.
Second, the application of stepper motor in filling and sealing machine
1. Workflow Tube silo (hose container) → Automatic pipe loading → Identification and positioning → hose internal cleaning (option) → Filling → Tail hot melt → Pressing and sealing tail, typing code → hose positioning→ shearing → finished product discharge.
2. Working principle using PLC program control. Automatic tube topping, color mark positioning, air cleaning of the inner space of the tube, injection nozzle deep into the pipe filling, hot gas heating of the inner wall of the pipe tail, cooling of the outer wall of the tail of the pipe (refrigerator drainage cycle), hot melt pressing typeing code, tail shearing, finished product discharge. Parameters are displayed digitally.
In the filling and sealing machine, the most critical step is the positioning of the hose. This product adopts German MOTEC stepper motor, model SM285-118H, and the driver adopts ST2-80-60. Pre-set stepper motor speed.
The color scale mode is equipped with a photoelectric switch, the photoelectric switch detects the position of the color scale, when the color scale is detected, a control switch signal is issued, and the stepper motor is pressed to the signal, stop rotating, delay for a certain period of time, and then rotate, and start again and again to ensure accurate positioning according to the position of the color scale.
The characteristics of stepper motors are mainly attributed to three aspects, one is good overloadability. Its speed is not affected by the size of the load, unlike ordinary motors, when the load increases, there will be a decrease in speed, so the stepper motor is used in occasions where there are strict requirements for speed and position; Second, it is convenient to control.
The stepper motor rotates in "steps", and the digital characteristics are more obvious, which brings great convenience; Third, the whole machine has a simple structure. The traditional mechanical speed and position control structure is more complex, difficult to adjust, and the use of stepper motors makes the structure of the whole machine simple and compact.