The sleeve labeling machine is a packaging machine that automatically cuts the tube label and accurately sets it into the container. With the subsequent heat shrinking process, the label is fixed in place in the container intact. The use of the sleeve labeling machine greatly reduces the manpower and material resources of the sleeve labeling link. It is now widely used in beer, beverage, chemical, pharmaceutical and other industries, especially in the juice processing production line, it is an indispensable equipment.
At present, most of the highest speeds of sleeve labeling machines produced in China are around 400bpm (bottles / minute), which can meet the needs of ordinary users. However, with the rapid development of the world's food packaging industry, more and more world-renowned juice drink manufacturers hope to make greater profits by increasing the production speed of the entire line.
After practice, Yonghong PLC is the core system configuration, which can help customers achieve a stable speed of 600bpm.
The technical difficulties of the standard machine mainly have 4 points:
â… . To make the speed of the whole machine reach 600bpm, the labeling action must be completed every 0.1 seconds, which means that the subscript motor needs to complete 150mm of displacement within 70ms, and the cutter motor completes one revolution within 30mS. Marking motors must be started and stopped frequently with accurate positioning;
â…¡. The subscript is rotated inward by two pairs of small guide rollers. The friction force between the roller and the film pulls down the label. Although the friction coefficient can be increased after using a special material, it is still difficult to avoid slipping at high speed. The occurrence of the situation, so that even if the subscript motor is positioned accurately, the phenomenon of uneven length of the subscript will occur;
â…¢. The rotation of the cutting motor drives the cutter to make one rotation to complete the cutting operation. Incorrect positioning of the cutting motor will cause the cutter to overshoot and eventually cause the cutter to block the label;
â…£.Communication with 4 inverters will increase the memory occupied by the program, prolong the cycle scan time of the program, and delay the action time of cutting and subscripting.
After analyzing the process difficulties, Panasonic finally used 2 servo systems to control the subscripting and cutting motors, and 4 inverters to control the motor, positioning belt, bottle feed screw, and rod label supply motor. These four inverters and small PLC CP1H communicates, and the motor speed can be adjusted by setting parameters through the man-machine interface NS8.
System solutions
In this scheme, the controller adopts a small FATEK PLC, which has high-speed command operation, built-in 4-channel 100kHZ high-speed pulse output, and is equipped with PLS2 instructions (pulse output trapezoidal acceleration and deceleration positioning instructions), without additional positioning The module can easily complete the simultaneous positioning of the 4-axis servo, which greatly saves the customer's electrical costs.
Two serial ports, RS232 and RS422 / 485, can be added at the same time, and the Smart FB (function block) can be directly called when communicating with the inverter, eliminating the need for customers to write complicated communication programs. Moreover, it also has a powerful interrupt function. The customer's subscript and cut program can be placed in the interrupt program that enters the interrupt. When the PLC receives the cut and subscript execution signal, it immediately transfers to the interrupt program to execute the cut and subscript Actions, so that these two actions are not affected by the program's scan cycle, and can be completed quickly, controlling the overall time within 0.1S.
In this scheme, the BWS-BBF chasing and shearing series servo control index is selected, which has the characteristics of short positioning time and high positioning accuracy. The BBF chasing and shearing series of simple servo-controlled cutting marks, while confirming the speed and positioning accuracy, are simple to operate and shorten the debugging time of the equipment. The Z-phase signal of the servo motor can replace the original cam to send a signal to mark the positioning completion. A5 series servos can be connected to the BWS servo monitoring software through data lines, which can realize the rapid setting of parameters and real-time monitoring of the servo running performance, helping customers quickly and accurately find the problem when the fault occurs.
Because the inverter used in this solution also needs to communicate with the PLC, Panasonic's BFV series inverter was selected. The inverter's built-in RS-422 and RS485 communication functions are very convenient for communication with PLC.
Delta's color touch screen NS is used on the sleeve labeling machine. Through its unique program library, it supports up to 1000 formulas and multi-language switching functions, and OMRON controllers and devices have simplified connection and screen production. Significantly save product development time.
Considering the problem of subscript slippage, BWS also used an on-beam optical fiber sensor to send the subscript completion signal to the subscript servo motor to control the subscript length, replacing the originally envisaged servo positioning to control the subscript length, as much as possible. The effect of skidding on subscripts.
From system products to high-end vision sensors, BWS's complete product system covers almost all the industrial control products required on the entire blister packaging machinery, and each product has its own independent advantages and high compatibility between our products. . After the customer adopts the BWS complete system solution, the labeling machine can reach a speed of 600bpm per minute when using 150mm labels and can run steadily. The labeling cycle of each bottle is less than 0.1S. This not only saves the workload and development costs, but also greatly improves the overall performance of the machine.
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