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Application of servo control system in heat shrinkable film packaging machine (Part 2)

function realization in the control process

acopos servo in the film packaging machine, the tasks to be completed are: driving the bottle pushing rod and film picking rod, feeding paperboard, feeding and cutting film and bottle separation. Among them, the tasks with synchronous relationship include cardboard feeding, film feeding and film cutting. Figure 3 illustrates the master-slave relationship between several axes. The left side of the arrow is dominant and the right side is subordinate. Although the bottle feeding motor does not participate in synchronization, in the bottle separation process, it, the pressing plate and the baffle are based on the phase angle of the main motor to perform the interrelated start and stop, and jointly complete the bottle separation task

Figure 3: master-slave relationship between several axes

white film feeding and cutting

film feeding and cutting are the most important links in the film wrapping machine and the most difficult part in the control process, especially film feeding

according to the requirements of the process, in the initial stage after the start of film feeding, the speed of film output should be consistent with the speed of a group of bottles to be wrapped, and the part pressed under the cardboard should be of a preset length, and curling cannot occur. In the remaining stages, the film should be quickly removed to ensure that the film pick-up rod can pick out the rear film unimpeded. The speed of these stages of membrane picking must also be controlled appropriately. Too fast will lead to membrane wrinkling, and too slow will cause membrane picking rod to be blocked. No matter how many stages, or how fast the film is discharged in the middle, we must finally ensure that after the main motor executes a cycle, the film feeding motor must also just complete one film feeding. That is, the film feeding motor and the main motor are synchronized once

different manufacturers design different film cutting mechanisms. At present, there are two kinds of mechanisms used more. One is to use an electromagnetic clutch on the film feeding motor shaft to pull in a cutter and rotate it for one circle after binding; The other is to keep the cutter as an independent motor shaft synchronized with the film feeding motor shaft. It is important to cut the film that the instantaneous linear speed of the cutting knife rotating the impact sample to cut the film should be greater than the linear speed of the point where the film is cut, otherwise the film may be scratched, cut continuously, and even cause the cutter teeth to collapse. The film wrapping machine of keshimin company adopts an independent cutter motor shaft, and the cutter participating in the synchronization with the film feeding motor can more directly adjust the speed of several synchronization stages during synchronization, ensuring the position accuracy of each film cutting, and can also participate in the color film control

for the feeding and cutting of white film, we should also pay attention to a very important problem: the film length control under different wrapping speeds. In order to ensure that the film roller will not continue to discharge the film due to inertia after the film is applied, a brake device will be added next to the film roller. Affected by the pulling factor of the brake device and the friction factor of the film roller, the actual film length will change at different wrapping speeds. In other words, if the film quantity of the film feeding motor remains the same at one time, the actual film feeding length will become shorter and shorter with the increase of the wrapping speed. Therefore, we need to increase the amount of film compensation for different wrapping speeds

bottle splitting

bottle splitting control in the film wrapping machine has always been a problem that cannot be ignored. The bottle splitting quality of the bottle splitting device will directly affect the subsequent wrapping speed, thus affecting the speed of the whole production line. At present, there are also two kinds of mechanisms used in the bottle separating device. One is to use two motor shafts to keep the synchronous relationship between one fast and one slow with the main motor; The other is to use the pressing plate, baffle and bottle feeding motor shaft to start and stop according to the phase of the main motor. The bottle separation device of the second mode prevents the bottle pouring phenomenon and improves the bottle separation speed

inlet bottle inlet and hot channel bottle outlet

in addition to film feeding and bottle separation, inlet bottle inlet and hot channel bottle outlet cannot reduce the control requirements. Both the inlet and the hot channel should be equipped with a frequency converter to smoothly control the conveying of bottles in and out. According to the requirements of the process, the speed of the inlet conveyor belt and the hot channel conveyor belt should maintain a proportional relationship with the main motor. In this way, the main motor, inlet conveying, bottle separation and hot channel conveying can be basically synchronized. The speed of inlet conveying controls the tightness between bottles, thus affecting the quality of bottle separation. The speed of hot channel transportation and the temperature will also make the film shrinkage after wrapping different. Therefore, the synchronous coordination of front and rear conveying is also a factor to be considered

discussion on color film feeding and cutting

white film has no position restrictions, and can start from any position, as long as the film length of each feeding and cutting is consistent. In contrast, the precision required by the position and length of color film feeding and cutting is much higher. In addition to the film length, the pattern symmetry of the color film after cutting is also a test standard. Generally, the printed color film is subject to annual verification. There will be a blank segment behind the two symmetrical patterns, which is the part to be cut. There will be a small black color mark mark (print) on the edge of the film of each blank part to be cut. A photoelectric sensor can capture this mark during the film feeding process, so that the servo controller can get this information. The process requires that once the mark is detected, the film motor will complete a displacement and then start cutting the film. If the film feeding motor keeps moving at a certain speed, the film cutting motor should be easy to control from detecting the mark and synchronizing with the film feeding motor to the final completion of film cutting. However, the film feeding motor still needs to be synchronized with the main motor to complete the track from slow to fast. Of course, the uniform feeding and cutting of color film can be used as the first manual calibration. Therefore, this time, a method of dynamically controlling the film length is adopted in the film wrapping machine of keshimin to control the feeding and cutting of color film, which meets certain process requirements. In fact, there should be other good methods for color film feeding and cutting, and foreign advanced experience is also worth learning from

heat shrinkable film packaging machine is the last link in the whole beer production line, and it is also an important factor affecting the final beer output. Domestic beer manufacturers have also started to use domestic film wrapping machines in the past two years. Therefore, there is still a certain space for effective improvement from the mechanical, electrical, or the control of the whole system

Author: baccalais Industrial Automation Co., Ltd. tested in Tongling jingxun special enameled wire Co., Ltd. indoor international trade (Shanghai) Co., Ltd. Zhang Ben

this article is extracted from servo control

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