Technology Development

Application of servo PLC system:

Adopted Omron motion controller system (integration module type), using the PTO (servo positioning module) system for high-speed

positioning, proximity sensors search the orbital target location, sending high-speed signals to the servo system. The position of the track is

detected online by the high precision rotary encoder built-in the servo motor, sending back informations to the control system, finally, high-

speed positioning is carried out by positioning module.

Application of the servo motor

The mould movement mechanism: Adopted the servo motor connect the gear box, synchronical transmission system is adopted to fulfill the

 reciprocating up and down motion of the two hinge mechanisms on both sides of the mold hauled by two linkage rods respectively. In this way,

the two mold holding plates in the middle move oppositely or towards each other, which is generally known as mold opening and closing. The

hauling wheel driven by the servo motor makes clockwise rounds continuously, reducing the power impact and the wearing, makes the mould

 clamping more smoothly. Each round leads to a complete cycle of mold holding plates movement------open and close. Also the high pressure

air supercharged mold locking mechanism is applied which buffs the impact between mold plates and effectively protects molds. Besides, it does

help to reduce the visibility of parting lines on finished bottles. The servo motor driven mold movement mechanism is designed and created

 upon rigid engineering simulation analysis, which ensures that the series of the mould motions are simple, accurate, consistent and speedy,

making cycle time 0.2~0.4 seconds.

The preform feeding and preform heating holders transfer mechanism: The preform feeding star wheel and preform heating holders

 transfer mechanism are driven by the servo motor synchronous belt linkage type drive step. For preform rotary heating system, the preform

 heating holders is controlled by variable frequency motor, preforms (preform neck is upwards) are 360 degree uninterruptedly rotary

 heating,48mm Preform heating pitch, more preforms are uninterruptedly heated within the same distance, which improves the efficiency and

energy saving above 40%. The same servo motor is used to synchronously operate on a slide track for rotating high-speed stepping positioning

 to simplify the structure, which makes the stepping track speedy and stable, shorten the production cycle time and greatly improve the

 production efficiency.

The perform after heated / variable pitch mechanism: This mechanisam is adopted the servo motor to connect the screw directly, the screw turns

 around, the pitch was changed from 48mm to 96mm directly, structure was changed to ensure high speed and accurate perform handling

 between the two mechanism.

Preform transfer system with the grippers and bottle out-feed mechanism: Heated preforms delivering into the blow mould and the finished

 bottles out-feed driven by the same servo motor & the synchronous belt, to ensure the high speed and accurate for these two motions.

The stretching mechanism (down stretching): the stretching rods are driven by a servo motor all at once, which ensures the synchronicity of

 the motion of the rods and makes it easier to do adjustment prior to production. (After interchanging the blow mould, makes it much easier to

 adjust the height of stretching rods, just need to input the datas on the touch screen, instead of doing the adjustment by manual.)

Application of thermostatic heating system

The modularized control system is used in the thermostatic flask blank heating oven, which use infrared lamps and reflector for

heating preform. After setting the temperature value, the equipment can automatically adjust the output voltage according to the

rate without being affected by voltage fluctuation and environmental temperature change. At the same time, it is also cooled by

circulating air controlled by frequency converter, which can effectively guarantee the internal heating temperature and constant

temperature of the heating ovens, and make the surface of each preform and its internal temperature uniformly heated.

Moreover, the bottle rotates 360 degrees in the heating ovens, so that each side of the preform can be heated evenly, which

improves the yield of blown bottle and the adaptability range of the thick-walled preforms.

The application of the full closed-loop voltage regulator in preform heating system:

The temperature of the heating ovens are controlled by the full closed-loop voltage regulator (with feedback) which

independently developed by RiBo company. The controller detects and adjusts the output voltage (set value) at the scanning

frequency of 218 times per second, so as to achieve the effect of evenly voltage output and solve the problem of unstable

heating effect caused by the heat fluctuation of heating element (lamps) due to the voltage fluctuation of the power supply. In

addition, the closed-loop control system interacts and cooperates with the original heating ovens’ constant temperature control

system, greatly improving the heating temperature fluctuation caused by environmental temperature change. By application of

the above technology in the bottle blowing machine, the heating uniformity and stability of each preform tend to be completely

consistent, which finally ensures the stability and uniformity of the bottle blowing effect of each cavity. This closed-loop unit has

further improved the overall performance of the bottle blowing equipment.

The machine is equipped with the preform temperature detection at the end of the last heating oven, if the preform temperature

does not reach the blowing temperature, the preforms going into the blow mould but no blowing, saving the air.