단일 스크류 펠렛화 기계

How to properly operate the pelletizing machine

pelletizing machine is a necessary equipment for many waste plastic enterprises.

Proper operation and use of the pelletizing machine can not only improve production efficiency, but also extend equipment life, reduce production costs, and improve product competitiveness.Therefore, we must properly operate, reasonably apply and properly maintain the pelletizing machine to ensure the normal operation of the pelletizing machine.

pelletizing machine operation

The operation of the pelletizing machine includes a series of links including the device installation, adjustment, commissioning, operation, maintenance and repair.

When using the pelletizing machine, special attention should be paid to its characteristics, and the operating points of the pelletizing machine should be well grasped.

Although the operating points of various pelletizing machines are different, they also have similarities.

1. Preparation before starting pelletizing machine

If the recycled material is used as the raw material for extrusion molding, the raw material should meet the required drying requirements, if necessary, further drying is required, and the recycled material is sieved to remove agglomerates and mechanical impurities.

Before operating the pelletizing machine, you need to check whether the water, electricity and gas systems in the equipment are normal to ensure that the water and gas channels are smooth and leak-free.Check whether the electrical system is normal, check whether the heating system, temperature control, and various instruments work reliably;Test run the auxiliary machine at low speed and observe whether the equipment works normally;Start the setting table vacuum pump and observe whether the work is normal;Lubricate the smooth parts of various equipment. Remove the fault if found.

According to the product variety and size, choose the specifications of the machine head and install them; clean the perforated plate and the various parts of the machine head, and replace the filter screen.

2. Start up pelletizing machine

Pelletizing machine can be started after constant temperature，Tighten the bolts of the machine head and the pelletizer flange again before turning on the machine to eliminate the difference in thermal expansion between the bolt and the machine head. The order of tightening the machine head bolts is diagonally tightening with even force.When tightening the flange nut of the machine head, it is required to be uniformly tight all around, otherwise the material will run away.

When operating the pelletizing machine, first press the “ready to start” button, then press the “start” button, and then slowly turn the screw speed adjustment knob to start the screw speed slowly.Then gradually speed up, while adding a small amount of raw materials.When adding raw materials, pay close attention to the indication of the host ammeter and various indication meters.Screw torque must not exceed the red mark.When the pelletizing machine is in operation, no one should stand directly in front of the die before the plastic profile is extruded to prevent injury accidents due to broken bolts or wet raw materials.

After the plastic is extruded from the die, according to the indication value of the control instrument and the requirements for the extruded product, adjust each part accordingly to make the entire extrusion operation reach a normal state, and add more raw materials as needed.

According to the condition of the extruded material, judge the plasticization degree of the material. If the plasticization is not good, the screw speed, barrel and head temperature can be adjusted appropriately until the requirements are reached.

Should regularly check whether the various process parameters are normal according to the process requirements, and fill in the process record sheet. Check the quality of the product according to the quality inspection specifications, and take corrective measures when problems are found.

3. Work after turning off the pelletizing machine

pelletizing machine operation stops feeding and squeezes out the plastic in the pelletizing machine. Turn off the barrel and head power and stop heating.

Turn off the power of the pelletizing machine and auxiliary machine to stop the screw and auxiliary machine.

If the machine head needs to be removed, cleaning work is required.Clean the perforated plate and the various parts of the machine head. When cleaning, prevent the internal surface of the machine head from being damaged.The remaining material in the machine head should be cleaned with copper sheets, and then the plastic adhered to the machine head is polished with sandpaper, polished, and coated with engine oil or silicone oil to prevent rust.

Cleaning of screw and barrel.Restart the main machine and add shutdown material (or broken material) to clean the screw and barrel. At this time, the screw is selected at a low speed to reduce wear.After the stopped material is crushed into a powder and completely extruded, the remaining pellets and powder can be blown out repeatedly from the feeding port and the exhaust port by compressed air. After there is no residual material in the barrel, reduce the screw speed to zero, stop the pelletizer, and turn off the main power and cold water valves.

Matters needing attention in pelletizing machine operation

The correct operation of plastic machinery can be used to extend its life. However, the use of plastic machinery does not get enough attention in our daily life, and it will also cause some unnecessary problems. So we must pay attention when using plastic machinery. What about those problems?

1. Pay attention to fire safety. The fire extinguisher should be placed near the equipment using thermal oil.
2. When a malfunction or abnormal situation occurs, the relevant personnel must be reported and handled by professional maintenance personnel. If any abnormal phenomenon affecting safety occurs, immediately press the emergency stop switch.
3. Do not use low-quality return materials with metal impurities or sand. Metal objects that may fall may not be placed near the feed port to prevent aggravating the wear of the screw and barrel, or causing jams and damage.
4. Plastic machinery operation should use hydraulic oil with cleanliness, viscosity and other indicators that meet the requirements, and provide sufficient flow of cooling water to the oil cooler in accordance with regulations to prevent hydraulic components and pipelines from being blocked or leaked due to oil pollution or high temperature Damage such as oil.The extruder should be filled with lubricant that meets the requirements.
5. Plastic machinery must be operated in strict accordance with the requirements of operating regulations, and illegal operations must not be performed at non-operating stations. To ensure the reliability of the safety device, the safety protection measures of the machine must not be destroyed for the sake of efficiency.
6. When the plastic machine is operating, the material temperature does not reach the set temperature, and the screw is not allowed to start when the holding time is not enough.
7. Operated by operators who are familiar with the mechanical properties and operating procedures of plastic machinery.

Failure analysis of pelletizing machine

During the daily operation of the pelletizing machine, various failures occur in the pelletizing machine, which affects the normal production of plastic machinery. Below is an analysis of some common failures of the pelletizing machine.