Abstract : This paper introduces the application of PLC in the glass tray packaging control system and describes the hardware configuration and software design of the system in detail. Put into operation results show that the effect is good.

Keywords: glass bottles and cans; tray packaging; programmable control; hardware preparation; software design

With the constant demand for the quality of glass bottles (including the appearance of cleanliness), the traditional sack packaging method can no longer meet the needs of production and markets. The tray packaging used in our factory can just overcome the disadvantages of sack packaging, which can reduce the breakage of glass bottles (especially the screw bottle and the shaped bottle) during packaging and transportation, and also avoid the product on the bottle after the sack is put for a long time. The ash was even stuck to the problem of sachets.

Due to the complicated mechanical structure, strict installation requirements and large investment in equipment, the complete online glass bottle tray packaging machine has adopted a PLC tray type winding machine with simple structure, convenient use and low cost. It uses LLDPE stretch film as Packaging material, which stretches and wraps the glass bottles on the tray. The packaged tray is very suitable for the storage and transportation of glass bottles and bottles, which greatly reduces the bottle breakage rate and improves the cleanliness of the bottles.

1, glass tray packaging process requirements and system work process

First, the glass bottles were manually filled with trays (manufactured in several layers according to bottle size, 1300mm x 1300mm in height and 800 to 2200mm in height) from the delivery belt, and were manually pulled to the Φ1650 steel plate turntable. Then, a LLDPE stretched film having a width of 500 mm and a thickness of 17 to 35 μm was passed through the lower end of the tray. Select "Manual" or "Automatic" working mode via the "HMI".

System working process: start the turntable first, close the switch, turn the film motor, and let the film wind 2 times at the lower end of the tray (the number of turns can be set). As the light is blocked by the glass bottles on the rotating trays, the photo switches fixed on the film rack and aligned with the wrapped glass bottles are “dark”, so the film racks with membranes and photoelectric switches rise. When the film is wrapped from the lower end of the tray to the glass bottle on the upper end of the tray, the increased photoelectric switch can receive light outside the tray, causing the photoelectric switch to “broke off”. However, in order to make the top cover tightly wrapped, you can set up the photoelectric switch "brightly broken", so that the film frame continues to edge edge rise for a few seconds (note: the film frame only up and down movement, and the tray is always rotating at a constant speed) Stop, and then wrap 2 turns above the tray (the number of turns can be set). Then the film holder is lowered and the film is wrapped in a glass bottle from above. Finally, 2 turns of film is wound on the lower end of the tray, and the tray stops rotating. Glass tray packaging ends.

2, system hardware configuration

The overall structure of the system is shown in Figure 1. Programmable controller TSX08CD8R6AS is the extraction center of the whole system. This PLC has complete functions and can reduce many intermediate contacts, which facilitates simplified wiring, optimizes design, and improves the reliability of equipment operation. It also adopts the TSX08H04M man-machine interface, which can easily select five pages such as “Manual Operation”, “Automatic Operation” and “Parameter Setting” to perform system debugging, parameter setting, adjustment and selection of system operation modes. At the same time, external frequency converters U1, U2, U3 are used to control the rotational speed of the turntable motor, the film frame lifting motor and the film feeding motor, respectively. In addition, the PLC input is also connected to S1 "Pallet Position", S2 "Film Frame Limit", S3 "Height Limit", S4 "Film Frame Upper Limit", S5 "Membrane Start" and S6 "Emergency Stop "Switch signals, so that the system is normal and safe operation.

3, system software design

According to the requirements of “Packaging process requirements and working process”, the tray packaging system has two modes of use: manual mode and automatic mode. When using manual mode, manually press the “A1” to “A8” button on the “Human Interface” operation panel one or more times. In case of special emergencies, the S6 emergency stop button can be pressed to stop the system. Before using the automatic mode, it is necessary to preset the "delay times of the bottom ring", the "number of windings of the top ring", the "number of times of running up and down", and the "delay time" of the film rack stopped after the photoelectric switch receives light at the top of the tray. Then press A8 to flip the screen to the autorun page.

The design must also pay attention to: allow to adjust the turntable motor, the film frame lift motor and the three sets of frequency control motor drive frequency control set value, so that the three motors with the appropriate speed, so that the best packaging effect of glass bottles; for safety In operation, the lifting and lowering position of the film holder shall also be taken into account separately; due to the strong light penetration between some special-shaped glass bottles, the orientation of the photoelectric switch or the sensing distance of the photoelectric switch must be properly corrected. In addition, it is not allowed to press the S6 button to stop it during the automatic stop.

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