Abstract: This paper introduces the application of PLC in glass bottle tray packaging control system, and describes the hardware configuration and software design of the system in more detail. The results of the operation showed that the results were good.
Key words: glass jar; tray packaging; programmable control; hardware configuration; software design
With the ever-increasing demand for the quality of glass bottles (including cleanliness of appearance), traditional sack packaging methods have been unable to meet the needs of production and the market. The tray packaging currently used in our factory can overcome the drawbacks of sack packaging, reduce the breakage of glass bottles (especially screw bottles and shaped bottles) during packaging and transportation, and avoid the accumulation of bottles on the bottles after they have been left for a long time. The ash is even stuck to the problem of sacks and decay.
Because the mechanical structure of the complete online glass bottle tray packaging machine is complex, the installation requirements are strict, and the equipment investment is large, so we chose the PLC tray type winding machine with simple structure, convenient use and low cost, which uses LLDPE stretch film as Packaging material, stretching and wrapping the glass bottles on the tray. The packaged tray is very suitable for storage and transportation of glass bottles, which greatly reduces the bottle breakage rate and improves the cleanliness of the bottle.
1. Glass bottle tray packaging process requirements and system working process
First, the glass bottle is manually filled from the delivery belt (can be divided into several layers according to the size of the bottle, the specification is 1300 mm × 1300 mm; the height is 800 to 2200 mm), and is pulled by a manual hydraulic truck to the steel plate turntable of Φ1650. Further, a LLDPE stretched film having a width of 500 mm and a thickness of 17 to 35 μm was inserted into the lower end of the tray. Select "Manual" or "Automatic" working mode via "Human Machine Interface".
System working process: first start the turntable, the proximity switch is turned on, the film feeding motor rotates, and the film is wound around the lower end of the tray 2 times (the number of turns can be set). Since the light is blocked by the glass bottle on the tray rotating at a constant speed, the photoelectric switch fixed to the film holder and aligned with the wrapped glass bottle is "dark", so the film holder is lifted with the film and the photoelectric switch. When the film is wrapped from the lower end of the tray to the upper end of the tray, the raised photoelectric switch can receive light from outside the tray, causing the photoelectric switch to "bright". However, in order to make the top cover wrap tightly, it can be set after the photoelectric switch is “bright offâ€, so that the film holder continues to rise for a few seconds while the bottle is on (note: the film frame only moves up and down, and the tray always rotates at a constant speed) Stop and wrap 2 turns above the tray (the number of turns can be set). The film holder is then lowered and the film is wrapped in a glass bottle from top to bottom. Finally, two turns of the film are wound at the lower end of the tray, and the tray stops rotating. The glass bottle tray is finished.
2, system hardware preparation
The overall structure of the system is shown in Figure 1. The programmable controller TSX08CD8R6AS is the extraction center of the whole system. The PLC is fully functional and can reduce many intermediate contacts, which is convenient for simplifying wiring, optimizing design and improving the reliability of equipment operation. It also adopts TSX08H04M man-machine interface, which can easily select five pages of “manual operationâ€, “automatic operation†and “parameter setting†to perform system debugging, parameter setting, adjustment and selection of system operation mode. At the same time, external inverters U1, U2, U3 are used to control the rotation 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 "tray in-situ", S2 "film frame lower limit", S3 "height limit", S4 "film frame upper limit", S5 "injection start" and S6 "emergency stop" "The switch signal is used to make the system operate normally and safely.
3, system software design
According to the requirements of "packaging process requirements and working process", the tray packaging system has two modes of manual mode and automatic mode. When using the manual mode, manually press the “A1†to “A8†dedicated buttons on the “Display Unit†operation panel one or several times. In case of special emergency, press the S6 emergency stop button to make the system stop urgently. Before using the automatic mode, you must preset the “number of windings of the bottom ringâ€, “the number of windings of the top ringâ€, “the number of cycles of the up and down operation†and the “delay time†when the photoelectric switch stops at the top of the tray after the light is received. Then press A8 to scroll the screen to the autorun page. The workflow diagram is shown in Figure 2.
Please pay attention to the design: allow the adjustment of the control frequency setting value of the three inverters of the turntable motor, the film frame lifting motor and the film feeding motor, so that the three motors can be matched properly, so that the glass bottle has the best packaging effect; For operation, the lifting limit position of the film frame should also be considered separately; because some of the shaped glass bottles have strong light entering between the layers, it is necessary to properly correct the photoelectric switch direction or adjust the photoelectric switch sensing distance. In addition, it is not allowed to press the S6 button to make an emergency stop during the automatic stop.
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