Application of KEWEI Intelligent Servo in New Bag Making Machine

1. System overview

This system is a new type of bag making machine control system.

At present, during the bag feeding process of the conventional bag making machine, every time a bag is cut, the bag feeding needs to be stopped once, resulting in discontinuous bag feeding, which also has a great impact on the cutting of relatively long bags, and one model can only be used for special purpose. bag.

The improved new bag making machine adds a balance roller to cooperate with the cutter, which realizes continuous and uninterrupted bag feeding and bag cutting, and can also cut long bags to make different types of bags.

And the improved new bag making machine can be flexibly connected with other equipment, such as directly connecting a film blowing machine at the head of the bag making machine, and connecting a winder at the end of the machine to complete the "film blowing-bag-making-winding". Roll" integrated production.

The cutter of the improved new bag making machine no longer rotates at a constant speed in the same direction, but rotates in the forward and reverse directions of the cam curve, so that the cutting depth of the cutter can be flexibly changed for different types of bags.

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(Figure 1 - On-site physical map)


2. System configuration 2.1 System configuration

model

quantity

MPS-I-3033-PT

(3KW intelligent servo)

2 units

MPS-I-1521-PT

(1.5KW intelligent servo)

2 units

TPC7062T

(Kunlun Tongtai touch screen)

1 set

130ST-M10025

(2.6KW motor)

2 units

130ST-M06025

(1.5KW motor)

2 units

Photoelectric switch

3


2.2 Technical indicators

index

parameter value

Production speed

20--150pcs/min

line speed

10—140m/min

bag length

200—2500mm

Bag width

100—1000mm


3. System plan 3.1 Process flow


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(Figure 2 - System structure diagram of bag making machine)


3.2 System solution

The bag-pulling shaft and the bag-feeding shaft are driven by two 1.5KW servo drives respectively, and the cutter and balance roller are driven by two 3KW servo drives respectively.

The bag-pulling axis and the bag-feeding axis are continuously and synchronously feeding the film at a constant speed, and the photoelectric switch detects in real time to ensure constant film tension. The newly added balance roller, the cutter and the bag-pulling axis cooperate with each other in an electronic cam curve model to achieve continuous feeding. The machine makes different kinds of bags.


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(Figure 3 - System structure of bag making machine)


3.3 Three-machine online system

The hoarded film from the machine head_film blowing machine passes through the top roller controlled by the inverter, which separates the film blowing machine from the bag making machine, and controls the film feeding speed independently. When the inverter controls the top roller to feed the film, it sends pulses to the main shaft of the bag making machine, and the servo main shaft amplifies the received pulse proportionally, so that the whole bag making machine is synchronized with the speed of the inverter and the top roller. And through photoelectric 1 and photoelectric 2 to adjust the amplification ratio of the spindle servo to the received inverter pulse, so that the film tension between the machine head part and the bag making machine is stable.

The bag making machine gives switching signals such as counting to the end of the machine_winder, and the winding machine performs the action of winding and changing according to the switching signal given by the bag making machine.

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(Figure 4-Schematic diagram of the three-machine online structure)


4. Function introduction

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(Figure 5-touch screen operation interface)


This system supports online modification of bag length and line speed, the maximum line speed can reach 140 m/min, the maximum cutting speed can reach 150 cuts/min, the film feeding process does not stop, and the film can be fed continuously;

It has a single-machine bag cutting mode and a three-machine online mode, and the three-machine online mode integrates "film blowing-bag-making-winding";

There are two types of bag types: color code and white bag;

The debugging is convenient and simple, and there are auxiliary functions such as stand-alone jog and online jog.

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(Figure 6-touch screen parameter setting interface)


V. Summary

The system makes full use of the motion instructions of the intelligent servo, and gives full play to the advantages of high integration and convenient programming of the intelligent servo in motion control. Electronic gear instructions; the four servos act in cooperation with each other in the relationship of electronic cams, and the goal of completing complex cam actions with one instruction is realized in programming, and the advantage of fast response speed is reflected in high-speed motion.

In terms of structure, the advantages of intelligent servo are also brought into play. One servo is used as the main shaft, and PLC is not required. Data exchange is completed between the four servos in the form of communication, and the motion relationship is controlled by pulse signals, so as to achieve the purpose of simple structure and cost saving.

(KEWEI Co., Ltd. designs a complete set of special control solutions according to the needs of your equipment and technology, which will perfectly show the unique advantages you need)

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