Application of Lenze intelligent servo on high-speed self-adhesive labeling machine

1. Introduction

Self-adhesive labels have long been widely used in many industries such as beverages, daily chemicals, medicine and electronics, and its clear and transparent plastic film has brought users a kind of "no label" visual impact, while achieving high-end atmosphere, its moisture resistance and physical properties are better than traditional paper labels, pasted on the bottle body can also increase the anti-collision ability of glass bottles, at present, some high-end beer and pharmaceutical bottles are using this high-grade crystal label, the market demand is becoming increasingly strong, compared with the traditional label, with no glue, no paste, It has the advantages of no dipping water, no pollution, saving labeling time, etc., with a wide range of applications, convenient and fast. However, due to the particularity of its material, the labeling equipment has high requirements, not only to ensure the efficiency of labeling, but also to ensure the quality of labeling, this article will introduce in detail the application of Lenze 9400HighLine intelligent servo controller in high-speed self-adhesive labeling machine.

2. Lenze Solution

Composition of high-speed self-adhesive labeling machine system: A self-adhesive labeling machine equipment is generally composed of three labeling stations, namely the main labeling station, the neck labeling station and the back labeling station. All three stations can be used independently or in combination. The structure of each labeling station is basically similar, and the main parts include the marking paper rewinding and unwinding part, the labeling motor, the blowing system and the pressurization system.

Application of Lenze intelligent servo on high-speed self-adhesive labeling machine

Features of self-adhesive label paper labeling:

The standard paper is made of transparent PET material, which is conveyed by roller and air compression, and it is easy to deform the tension of the standard paper, so the deviation correction mechanism of the standard paper must be added to the control to ensure the accuracy of the positioning position.

A single sheet of the standard paper is very light and thin, after the separation of the standard paper and the bottom paper, it is very easy to be affected by the external environment, when the standard paper stops at the starting labeling position, the wind speed and water droplets of the outside world will affect the angle of its labeling, thereby affecting the labeling effect, so it is very important to plan the zero point position of the standard paper and the movement track when sending the standard.

The label paper is glued to the transparent liner separately from the label paper, and the labeling process is intermittent and discontinuous. In the dynamic process of labeling, the motor needs to accelerate from zero speed to the speed synchronized with the large plate in a bottle time, and then decelerate and stop, which challenges the dynamic response of the motor and the performance of the servo, at the speed of 60,000 bottles / hour, the motor is required to accelerate from zero speed to 1700rpm within 60ms, and then decelerate and stop to zero speed, and also to overcome the position deviation effect caused by the tension deformation of the material at high speed.

The servo system is required to be able to easily control the blowing valve and pressurized valve in the standard station, and the rewinding and unwinding department, so the IO expansion ability and programmability of the servo are required.

Combined with the above characteristics and requirements, we give the following solutions:

3. Key features implemented

The cam curve design of the marking paper motion trajectory, the labeling action is the start-stop type, which is composed of three parts, namely the acceleration area, the synchronization area and the deceleration area, and adopts the five-order polynomial curve design.

The cam curve is switched online in real time to ensure that the standard paper of different specifications can be seamlessly connected.

Due to the existence of the tension of the standard paper, there will be a certain amount of deformation after each piece of label paper is pasted, resulting in a change in the stop position of the standard paper. To ensure the quality of labeling, it is necessary to ensure that after each label is completed, the next label paper can also stay in the same position, which needs to join the mechanism of deviation correction, the principle is: through a fast-response standard paper detection sensor access to the fast response IO of servo, at the moment of detecting this sensor signal, a timestamp is generated inside the driver, the position value of the moment is calculated by the linear interpolation method, and compared with the theoretical set position value, an error position ∆X, Then the error position value is superimposed on the main speed calculated by the cam controller in the form of trapezoidal wave or triangular wave velocity, so as to affect the actual output of the position value, so as to achieve the function of error adjustment.

4. Lenze Highlights

Based on the automation of the drive, the equipment is a typical high-performance single-axis automation equipment, using a modular design concept, the logic control part is relatively simple, but the performance requirements for the servo system and the motor are very high, and its combined application mode requires a single device can also be self-contained, Lenze 9400 HighLine intelligent servo is tailored for this kind of application characteristics of the equipment, with a very high cost performance.

The Lenze 9400 HighLine intelligent servo has powerful programming capabilities, allowing users to be more flexible and convenient in use, and the built-in CANOpen bus is very convenient for the expansion of IO points and the control of rewinding and unwinding servos. At the same time, it can be equipped with a variety of fieldbuses, which can easily communicate with the mainstream upper-level systems on the market.

Lenze's DSD selection tool can make reasonable suggestions for the customer's mechanical design according to the mechanical and production indicators given by the customer, combined with the selected drive and motor, to reduce the risk of failure, for this high-speed equipment, the appropriate load inertia is very important.

Lenze MCS series synchronous motors have distinctive characteristics, small inertia, high speed, high dynamic response, high overload capacity, and optional Hiperface singleturn absolute encoder, which effectively ensures the accuracy of motor speed and position at high speed.

5. Outlook

Label is an important part of the commodity, as a kind of identity authentication of the commodity, is an excellent embodiment of the corporate brand on the commodity, and directly affects the beauty of the commodity, so it is more and more valued by manufacturers and consumers. As one of the very important ones, self-adhesive label paper has very distinctive characteristics, which has developed very rapidly in China in the past ten years, but due to the limitations of mechanical systems and production processes, the labeling speed of the current domestic self-adhesive labeling machine is generally between 10,000 and 30,000 bottles per hour, while the high-speed self-adhesive labeling system with Lenze 9400HighLine intelligent servo control has been able to run stably at a speed of 50,000 bottles per hour. With the development of China's machinery manufacturing level, the gap between the manufacturing level of labeling machines and foreign products is getting smaller and smaller, and the rapid development of labeling machines has become an inevitable trend, which will bring new opportunities and challenges to the development of Lenze in the industry.

Application of Lenze intelligent servo on high-speed self-adhesive labeling machine

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