Correct and reasonable use of extruder can give full play to the efficiency of the machine, keep good working condition and prolong the service life of the machine.

The use of screw extruder includes a series of links, such as machine installation, adjustment, commissioning, operation, maintenance and repair, etc. Its use has the commonness of general machines, mainly manifested in the aspects of driving motor and decelerating and shifting device.But the working system of the screw extruder, which is the extruder system, has its own characteristics, which should be paid special attention to when using the screw extruder.Machine installation, adjustment, commissioning general in extruder are specified in the instruction for use, this approach to the operation of the extruder, maintenance and maintenance of the paper are as follows: first, the operation of the extruder methods: operators must be familiar with the structure characteristics of the extruder, operated by themselves especially must correctly grasp the structural characteristics of the screw, heating and cooling characteristics of control instrument, the nose and assembly, etc., in order to correctly grasp the extrusion processing conditions, the right to operate the machine.The operation method of extruding different plastic products is different, but there are some similarities.The following is a brief introduction to the same operation steps and matters needing attention when extruding various products.

1. Preparation before driving

(1) Plastics used for extrusion.The raw materials shall meet the required drying requirements, and further drying shall be required if necessary.The raw materials are sifted to remove agglomerates and mechanical impurities.

(2) Check whether the water, electricity and gas systems in the equipment are normal, ensure that the water and gas lines are smooth and no leakage, whether the electrical system is normal, whether the heating system, temperature control and various instruments work reliably;Empty auxiliary engine low speed test, observe whether the equipment is running normally;Start the vacuum pump of the setting table and observe whether it works normally.Lubricate in various parts of equipment.Troubleshooting if found.

(3) Installation head and set cover.According to the product variety, size, choose the specifications of the head.Install the nose in the following order.

(1) The head should be assembled together and installed on the extruder as a whole.

(2) before the assembly of the machine head, should wipe off the oil coated when saving, carefully check the cavity surface whether there are scratches, scratches, rust spots, necessary polishing, and then on the surface of the flow passage coated with a layer of silicone oil.

(3) Assemble each plate of the machine head together in order, the thread of the bolt is coated with high temperature grease, and then screw on the bolt and flange.

(4) place the porous plate between the head flange to ensure that the pressure of the porous plate and not overflow.

(5) Before tightening the fastening bolts of the connecting flange between the machine head and the extruder, the horizontal position of the orifice die should be adjusted. The square head can be adjusted horizontally, and the circular head can be adjusted with the base surface of the rubber bottom surface of the shaping model as the reference.

6. Tighten the flange bolts, tighten the head fastening bolts, install the heating ring and thermocouple, pay attention to the heating ring and the external surface of the head tightly.

Install and adjust the setting sleeve in place, check the main engine, setting sleeve and the center line of the tractor are aligned.After adjustment, tighten the retaining bolt.Connect the water pipes and vacuum tubes of the type sleeve.

Open heating power, the head, machine uniform heating.Open the inlet valve of cooling water and exhaust vacuum pump at the bottom of feeding hopper and gear box.When heating, the temperature of each section is firstly set to 140 ° C. When the temperature rises to 140 ° C, the temperature is held for 30-40min, and then the temperature is raised to the temperature of normal production.When the temperature rises to the temperature required for normal production, keep it for about 10min to make the temperature of all parts of the machine tend to be stable before starting production.The length of insulation time varies according to different types of extruders and plastic materials.Heat preservation for a period of time, in order to make the machine internal and external temperature consistent, lest the instrument temperature has reached the required temperature, but the actual temperature is too low, if the material into the extruder, because the actual temperature is too low, the material melt viscosity is too large, will cause axial force overload and damage the machine.9) Pet-Type (PEt-type) material is fed into the hopper for use.

(1) Start the machine after constant temperature. Before starting the machine, tighten the head and the flange bolts of the extruder again to eliminate the difference between the bolts and the thermal expansion of the machine head. Tighten the head bolts diagonally and evenly.When tightening the flange nut of the machine head, it is required to have the same elasticity all around, otherwise it will run out of material.(2) Start, select "ready to start" button, then "start" button, and then slowly turn the screw speed adjustment knob, screw speed slow start.Then speed up gradually and add a little more.When feeding, pay close attention to the host ammeter and various indicators of the indicator head changes.Screw torque shall not exceed the red mark (generally 65%-75% of the torque gauge).No one should stand in front of the die until the plastic profile is extruded, in order to prevent injury accidents caused by bolt breakage or damp release of raw materials.After the plastic is extruded from the nose orifice, the extruder is slowly cooled, hooked up to a traction device and a shaping mold, and actuated.Then according to the indicated value of the control instrument and the requirements of extruded products.Each part is adjusted accordingly so that the whole extrusion operation reaches a normal state.

In the plastic extrusion molding equipment, the plastic extruder is usually called the main machine, and its matching subsequent equipment plastic extrusion molding machine is called the auxiliary machine.After more than 100 years of development, plastic extruder has been derived from the original single screw twin screw, multi-screw, and even no screw and other types.The plastic extruder (host machine) can be matched with various plastic molding auxiliary machines, such as pipe material, film, holding material, single wire, flat wire, packing belt, extrusion net, board (sheet) material, special profile, granulation, cable covering, etc., to form various plastic extrusion molding production lines and produce various plastic products.Therefore, no matter now or in the future, plastic extrusion molding machine is one of the widely used machines in the plastic processing industry.Classification of extruders With the extensive application and continuous development of plastic extrusion molding technology, the types of extruders are increasingly updated, its classification methods mainly include the following 5 kinds.

1. According to the installation position, it can be divided into vertical extruder and horizontal extruder;

2. According to the usage, it can be divided into molding extruder, mixing and making extruder and feeding extruder.

3, according to the number of screw, can be divided into no screw extruder, single screw extruder, twin screw extruder and multi-screw extruder

4, according to whether exhaust, can be divided into exhaust type extruder and non-exhaust type extruder 5, according to the screw speed, can be divided into ordinary extruder, high speed extruder and super high speed extruder.Maintenance method of extruder

Place the plastic extruder equipment in a ventilation position to ensure the heat emission of the motor and extend its life;The machine should be well grounded.

2. Regularly check the tool screw. After 1 hour of use of the new machine, tighten the tool with the tool, fix the screw of the knife, and keep the tool rest;The bearing should be regularly filled with lubricating oil to ensure the lubricity between the bearings;In order to ensure the sharpness of the cutting tool, should always check the tool, to ensure its sharpness, reduce the blunt blade caused by other parts of the unnecessary damage;Check whether the belt is slack and tighten it in time.

3. Restart -- Before starting the reinforcing-blade the second time, clean the leftover bits in the machine room to reduce the resistance. Open the inertial housing and pulley housing regularly to clean the ash opening at the bottom of the flange plate.

4. Replacement of components -- When replacing the cutter, the clearance between moving and fixed cutter: 0.8MM for a crusher with more than 20HP and 0.5mm for a crusher with less than 20HP. The thinner the recovery material is, the clearance can be adjusted appropriately.