The extruder shall bear all kinds of dynamic loads from the beginning of production operation.Due to various parts of the work wear and corrosion by melting and decomposition gas transmission, environment pollution and operation method of error influence, such as work after a period of time, its working performance and efficiency of work will change or slightly down.The maintenance of the equipment is designed to prolong its service life and keep its working performance and production efficiency in a normal state for a long time to improve economic efficiency.
The maintenance of extruder can be divided into daily maintenance and regular (monthly, quarterly, annual) maintenance.The daily maintenance of the extruder refers to the maintenance inspection of the extruder in the normal production work of the extruder.If after the shift of the equipment to add lubricating oil, tighten loose nuts, scrubbing equipment for oil and other work.These work are also parts of the extrusion machine operation procedures, so for extruding machine operators, earnestly implementing procedures, in accordance with the requirements of extruder production sequence of operation, good maintenance of equipment is one of the content of.
The quality of raw materials used in the production is often checked, and it is not allowed to enter into the machine tube with the mixing of sand grains and metal powder.(2) per shift inspection at least 1 ~ 2 times the lubrication parts, add lubricating oil, bearing parts working temperature should not exceed 50 ℃.Before the feeding production, the cylinder and molding mould should have no less than 1h heating and constant temperature, and it is not allowed to make production under the conditions of raw material plasticization temperature.The screw must be started at low speed and only after a period of operation at low speed will allow the screw speed to increase gradually.The idle time of the screw in the barrel is not allowed to exceed 2 ~ 3min.6 always observe the main extruder in the current change of the motor, when found that electric machine long time work under overload condition (allow instantaneous overload), should immediately stop, look for the cause of the problem, troubleshooting and then continue to produce.After the first heating of the machine tube, the machine tube should be tightened once again with the fixed screw.Before installing the screw and the mould, clean the contact surfaces of each part. Tighten the bolts and apply a layer of molybdenum or silicone oil to facilitate the removal of the parts in high temperature.When disassembling the parts, do not use heavy hammers to knock on the working face of the parts. When necessary, hardwood should be cushioned, and the parts should be removed by hammering hardwood with hammers.When removing the material from the cylinder, screw and mould, it can only be scraped with bamboo or copper cutting tools, no steel knife and no fire method.
(month, season) maintenance key: the first time of production of new extruder, after the test production time of more than 500h, to replace the new lubricating oil, to eliminate the old lubricating oil;The lubricating oil filter, pipeline, oil cup and fuel tank should be cleaned and then added to the required amount of oil.Check the wear condition of the direct current motor carbon brush every month and replace when necessary.Clean the dust and dirt in the electric control box every season, and check the amount of oil in the lubricating oil tank every season (month), and add sufficient lubricating oil to meet the requirements of the work.When the parking time is longer, the main parts of the extruder (machine, screw and die etc.) should be protected against corrosion, anti-pollution and anti-weight pressure.The inlet and outlet of the cylinder and mould should be sealed with oil paper to prevent entering into water or other debris.
In the end of the year, it is important to check the wear condition of V belt and belt wheel in V belt transmission, and adjust the distance between the two V belt wheel transmission center so that the V belt is elastic and moderate.All wear and tear should be replaced.Exit the screw and check the wear condition of the cylinder and screw.For mild cuts or rough surfaces, grind with oil or fine sand to restore smooth and smooth.The inner circle and the outer circle of the inspection machine barrel and screw are recorded.To remove gearbox and bearing gland, inspect the lubricating oil quality in the box body: clean the lubrication part when necessary and filter or replace the lubricating oil.Check the wear of transmission gear and rolling bearing, and survey the badly worn gears.According to the requirement, make the gear spare parts manufacture or purchase plan, prepare for the next repair time change.Check the heating temperature of the calibration machine tube and the molding mold (with mercury thermometers) and the control box to display the temperature difference to ensure the correct operation of the process temperature during production.To adjust and test the safety alarm devices, check the accuracy and reliability of the work.Test, check water, gas and oil pipelines are free and leakage.Block area for cleaning and maintenance.Check and adjust the electric heating device in each part, cooling the working position of the fan and safety cover to ensure that they can work normally and efficiently.The specification model of oil seal pad, bearing and V belt is recorded, and the purchase plan for replacement of spare parts for the next repair is proposed.