Pipe extruder equipment belongs to a type of plastic machinery, usually divided into four categories: twin-screw extruder, single screw extruder, rare multi screw extruder, and non screw extruder. In the production process of enterprises, this equipment is the key to production and directly affects the comprehensive benefits of the enterprise. Whether mechanical equipment can operate normally in the production process of enterprises mainly depends on the completeness of the machinery. So let's learn together about the precautions for using the extruder, the maintenance of the barrel, and how to choose this machine!
In use, there are certain precautions for machinery. Let's take a look first:
1. The extruder should run forward to avoid reverse rotation.
2. Never operate on an empty stomach. It is necessary to operate with a hot machine and feed to avoid sticking to the shaft.
3. It is strictly prohibited for iron tools and other miscellaneous items to enter the feed inlet and vent hole of the extruder to avoid accidents and affect production.
4. Safe use of electricity and grounding wire.
5. During machine operation, it is prohibited to touch rotating parts such as the feed inlet, discharge outlet, belt, and gear with hands.
6. Lubricating oil should be injected before using the machine to avoid damage.
In order to improve the economic and social benefits of enterprises, the completeness and normal operation of machinery account for a large proportion. It can also have a certain impact on the assessment items of enterprise production. The wear of the plastic extruder barrel is mainly manifested in the increase of the inner diameter of the barrel with the wear during use. Due to the higher hardness of the inner surface of the barrel than the screw, the damage of the barrel occurs later than that of the screw. The following items need to be noted during the maintenance method and repair process of the barrel:
1. The diameter of the barrel increases due to wear. If there is still a certain nitriding layer, the inner hole of the barrel can be directly drilled and ground to obtain a new diameter size, and then a new screw can be prepared according to the new diameter.
2. Through machining, the inner diameter of the barrel is trimmed and alloy is re cast, with a thickness controlled between 1-2mm, and then precision machined to the necessary new size.
3. Under normal circumstances, the wear of the homogenization section of the barrel is faster than other positions. The homogenization section can be bored and repaired, and then equipped with a nitriding alloy steel liner. The inner hole diameter should refer to the screw diameter and be left in the normal fitting gap for processing and preparation.
4. The commonly used materials for manufacturing screws and barrels in China are 45, 40Cr, and 38CrMoAlA. However, the commonly used alloy steels for manufacturing screws and barrels in imported extruders are 34CrAINi7 and CrMoV9, with a yield strength of about 900MPa. After nitriding treatment, it has both wear resistance and good corrosion resistance, with a hardness of over 1000HV.
How do we choose a good extruder?
1. Firstly, determine whether the extruded product is plastic or rubber;
2. Determine the screw diameter based on the cross-sectional size of the product;
3. If it is a rubber product, it is necessary to determine whether the extruder needs to exhaust (cold feed) based on the vulcanization process;
4. After determining the above content, examine the configuration, quality, and manufacturer capabilities of different brands of equipment.
Alright, the basic precautions and maintenance of the extruder have been explained, everyone now has a certain understanding, right!