Plastic bag bundling machine and bundling method thereof

Abstract

The invention discloses a plastic bag bundling machine and a bundling method of the plastic bag bundling machine. An annular rubber band is adopted for bundling a plastic bag which is folded into a strip shape. The plastic bag bundling machine mainly comprises a machine frame, a vibration disc device and a plastic bag conveying device, and is characterized in that a U-type notch is further formedin the vibration disc device, and a rubber band opening device is further arranged at the position corresponding to the U-type notch and mainly comprises a support, a first sub-expanding rod, a bottom-side expanding rod and two side expanding rods. Firstly, the annular rubber band is expanded by the first sub-expanding rod to form a rectangle, and the longer and narrowing annular rubber band can be easily moved out of the U-type notch, and then the annular rubber band is expanded by the bottom-side expanding rod and the two side expanding rods into a square or a rhombus correspondingly. By means of the plastic bag bundling machine and the bundling method, mechanical arm rubber band transferring devices in the prior art are omitted, so that working procedures are simplified, the work is stable, the structure is simple and compact, the tightness degree of the expanded rubber band is uniform, and the finished product rate is high.

Description

technical field [0001] The invention relates to a plastic bag binding machine and a binding method thereof, in particular to a binding machine and a binding method for binding plastic bags by using annular rubber bands. Background technique [0002] The plastic bags automatically produced by the bag making machine, in order to facilitate storage, sales and use, these plastics need to be folded into long strips, and then tied with a ring rubber band in the middle of the folded long strips of plastic bags before they can enter the market . [0003] Authorized notification number CN208070086U discloses an automatic strapping machine (hereinafter referred to as reference document 1), which mainly includes: a main material feeding mechanism, an auxiliary material feeding mechanism, and a strapping mechanism. Its binding mechanism includes a spreader and a manipulator. Application publication number CN108773518A discloses an "automatic binding device for plastic bag making machi...

AI Technical Summary

Problems solved by technology

The problem is: first, after the manipulator grabs the rubber band, the rubber band will sag, and the sagging of the rubber band will cause the inner diameter of the originally round rubber band to become elliptical, which is not conducive to the simultaneous insertion of four struts. The success rate is small, which seriously affects the working stability of the machine; the second is that the rubber band is easy to shake and shake during the process of being grasped and transferred by the manipulator, and it takes a long time to stabilize

The existing problem is that when the two pins of the horizontal stretching mechanism stretch the rubber band horizontally, the length of the circumference of the rubber band will be equally divided into upper and lower sections at the positions of the two pins, because the rubber band has a higher Elasticity, when the relative position of the two pins remains unchanged, when the upper rubber band (two pins) is tightened or pulled, only the upper rubber band can be tightened, while the lower rubber band Because the resistance of the two pins cannot be tightened, this phenomenon is generally called "not walking the rope".

When the two supporting rubber bands described in the comparative document 4 hold up the upper part of the rubber band upwards, although a trapezoid can be formed to be placed on the plastic bag, it can only tighten the upper part of the two pins. This makes the lower part of the rubber band looser and the upper part of the rubber band is too tight and easy to break

That is to say: the stretching and transposition of the rubber band in the comparative document 4 includes a horizontal stretching mechanism and a vertical stretching mechanism. The two rubber bands clamping your hands can only stretch the upper part of your rubber band, the lower part of the rubber band cannot be stretched tightly, but the upper part of the rubber band is easy to break if it is too tight, and it is precisely because of this way of supporting the elastic The degree is different, so it is difficult for this strapping machine to adapt to the market

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