September 3, 2021
Application of integrated closed-loop stepper motor in packaging machinery
The integrated closed-loop stepper motor control gear pump can also achieve accurate metering. Gear pumps have been widely used in conveying viscous materials, such as syrup, bean paste, white wine, oil, tomato sauce, etc. At present, piston pumps are mostly used in the measurement of these materials, which have disadvantages such as difficulty in adjustment, complicated structure, inconvenient maintenance, high power consumption, and inaccurate measurement. The gear pump metering is measured by a pair of gears meshing and rotating, and the material is forced from the feed port to the discharge port through the space between the teeth. The power comes from a stepper motor. The position and speed of the stepper motor are controlled by a programmable controller. The metering accuracy is higher than that of the piston pump. The stepper motor is suitable for running at low speed. When the speed increases, the noise of the stepper motor will increase significantly, and other economic indicators will decrease significantly. For gear pumps with a relatively high speed, it is better to choose a speed-up structure. We started to adopt the structure of a stepper motor directly connected to the gear pump on the viscous packaging machine. As a result, the noise is unavoidable and the reliability is reduced. Later, a spur gear was used to increase the speed to reduce the speed of the stepper motor, the noise was controlled, the reliability was also improved, and the measurement degree was guaranteed.
1、Application of integrated closed-loop stepper motor in supplying and delivering packaging film
In a packaging machine that integrates bag making, filling, and sealing, the plastic film for packaging is required to be positioned and supplied at a fixed length. Whether intermittent supply or continuous supply, it can be reliably completed by a stepper motor.
1. Used for intermittent packaging machine
The intermittent packaging machine uses a stepping motor to supply the film, and the reliability can be improved. The previous packaging film supply and delivery mostly used the crank-link mechanism intermittently pulling the belt, which was complicated in structure and difficult to adjust. Especially when the product needed to be replaced, it was not only difficult to adjust, but also wasted a lot of packaging film. Adopting a stepping motor and a pulling belt roller to directly connect the pulling belt, not only the structure is simplified, but also the adjustment is extremely convenient. It can be realized only through the buttons on the control panel, which saves adjustment time and packaging materials. In the intermittent packaging machine, the supply of packaging materials can be controlled in two modes: bag length control mode and color code control mode. The bag length control mode is suitable for packaging film without color code. It is realized by pre-setting the speed of the stepper motor, and the setting of the emptying ratio can be realized through the DIP switch. The color code mode is equipped with a photoelectric switch. The photoelectric switch detects the position of the color code. When the color code is detected, it sends a control switch signal. After the stepper motor receives the signal, it stops rotating. After a certain delay, it rotates to feed the film, and the cycle repeats. , To ensure that the film length is fixed according to the position of the color code.
2. Used for continuous packaging machine
In the continuous packaging machine, the stepping motor is continuously rotating, and the packaging film is uniformly and continuously transported. When the bag length is changed, it can be realized only by the dial switch.
2. Application of integrated closed-loop stepper motor in horizontal sealing
In the continuous packaging machine, the horizontal seal is a very important executive mechanism, and it is also one of the more complicated mechanisms in the packaging machine. Especially for color-coded packaging films, the sealing and cutting position requirements are extremely strict. In order to improve the accuracy of cutting, people have developed eccentric sprocket mechanisms, crank guide rod mechanisms, etc., but these mechanisms have troublesome adjustments and reliability. Low disadvantage. The main reason for these shortcomings is that the process requires the horizontal sealing wheel to be fixed-speed, horizontally sealed and positioned to cut off. The stepping motor directly drives the horizontal sealing wheel to achieve speed synchronization. The film supply wheel of the continuous packaging machine is for continuous film supply. During horizontal sealing, the linear speed of horizontal sealing is required to be synchronized with the speed of film feeding to avoid tearing of the film and film accumulation. Since the diameter of the horizontal sealing wheel is constant, when the bag length is changed, it needs to be changed by changing the rotation speed of the horizontal sealing wheel, but the horizontal sealing requires a certain time, that is, the horizontal sealing wheel and the film need to be constant from contact to separation. Time, otherwise the seal is not tight. The total time of each rotation of the horizontal sealing wheel and the time required for horizontal sealing are constant. To meet the requirements of speed synchronization, the rotation speed of the stepper motor can be divided into two parts. The first part is full.
It meets the requirements of speed synchronization. In addition, in the continuous packaging machine with no load, the stepper motor is continuously rotating, and the packaging film is uniformly and continuously transported. When the bag length is changed, it can be achieved only by the dial switch.
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