Extrusion Blow Molding Machine Regular Maintenance Project(Comprehensive Guide)


The regular maintenance of the extrusion blow molding machine is to better exert the performance of the blow molding machine and produce better plastic blow molding products.

Today, the editor of Yankang wants to share with you what are the regular maintenance items for plastic blow molding machines.

The maintenance of the plastic blow molding machine is divided into regular maintenance and daily maintenance.

Regular maintenance is the maintenance work for the entire plastic extrusion blow molding machine equipment after a certain period.

The daily maintenance is the maintenance work every day or every time the machine is shut down or every few days.

This article is about the regular maintenance project of the plastic extrusion blow molding machine.


What is included in the regular maintenance of the extrusion blow molding machine?

Regular maintenance is an important link in the maintenance of the extrusion blow molding machine. Including 3 to 6 months, 12 months, and 36 months of regular maintenance, generally called minor repairs, medium repairs, and overhauls.

(1)Extrusion blow molding machine regular maintenance-minor repairs

①Clean the feeding pipe of the feeding system and replace the seals.

② Clean up the vacuum system.

③The machine head leakage treatment and the maintenance and cleaning of the filter replacement device.

④Check and deal with the leakage of cooling water, lubricating oil, and other pipelines and fittings.

⑤ The working oil of the hydraulic system should be added in time to ensure that the oil level is in the middle of the oil standard.

To ensure that the working oil has a suitable viscosity, it is recommended to use 32# mill hydraulic oil when the ambient temperature is low, and 46# mill hydraulic oil when the ambient temperature is high.

⑥ Every half month to one month, the oil level window of the reducer should be observed. If the oil level is lower than the specified value, an appropriate amount of 220 intermediate hydraulic gear oil (LCKC220) should be added in time.

After the new machine is put into use, the lubricating oil should be changed once within 300~600h. The replacement time should be when the reducer stops until the lubricating oil has not cooled down, the box should also be flushed with lubricating oil of the same quality.

(2)Extrusion blow molding machine regular maintenance-intermediate repair

When the extrusion blow molding machine is repaired, in addition to the minor repairs, there are mainly the following aspects.

①Check the screw surface, screw spline (or flat key) and clean it.

② Check or replace the porous plate and filter replacement device. Repair the surface of the pallet and adjust the clamping force.

③Check the tooth surface condition and contact condition of the gear in the reduction box. Measure the tooth gap, clean up the dirty oil at the bottom of the gearbox, eliminate the oil leakage of the oil seal and other sealing parts, and change the oil.

④Check the concentricity and wear of the connecting sleeve (or spline sleeve) between the output shaft of the reducer and the screw.

⑤Check the main motor bearing and add grease.

⑥Check the electric heater and electric control part.

⑦Hydraulic system inspection. Including: changing the working oil according to regulations; cleaning or replacing the filter device; checking the performance of each valve and replacing it if necessary; checking the servo system as required to ensure the quality of the parison.

(3) Extrusion blow molding machine regular maintenance-overhaul

In addition to the content of the overhaul, the content of the overhaul also includes the following aspects.

① Disassemble and pull out the extruder screw.

When disassembling the screw of the extruder, it should be noted that the material in the barrel must be completely melted, and the molten material in the barrel must be extruded before disassembly. In the process of pulling out the screw, the screw should be prevented from deforming and bruising, and the steel wire rope used should be covered with a rubber tube.

To clean up materials and carbon deposits on the surface of the screw, the tools used are copper rods, copper plates, and copper brushes.

Measure and record the outer diameter of each section of the screw, measure the straightness of the screw, and straighten it if necessary.

Measure the fit clearance of screw splines or flat keys, record wear, and remove burrs.

The outer diameter of the screw, the general allowable limit of wear is ≤ 2mm.

The straightness deviation of the screw axis should not be lower than the 8-level accuracy specified in GB/T1184, otherwise, it should be corrected.

The part where the chromium plating layer falls off can be repaired by brush plating or spray plating.

② Overhaul the scratched parts on the inner surface of the barrel.

③Check and adjust the coaxiality of the barrel to the output shaft of the reducer, and the levelness of the barrel and reducer, measure, and record the gap between the screw and the barrel.

The level deviation of the front and rear ends of the barrel is less than or equal to 0.05mm/m, and the inclination direction is the same.

④Disassemble and inspect bearings, lubricating oil pumps, oil distributors, seals, and moving parts.

⑤Disassemble and check the main reducer, repair the gear tooth surface, and adjust the gap of each part. Check or replace the wearing parts such as the bearing oil seal, clean the oil tank, and change the oil.

⑥Disassembly inspection or repair of the feeder and feeding motor.

⑦ Overhaul the hydraulic system. Fully clean, inspect and test all hydraulic components (especially pumps and valves), and replace those that fail to meet the requirements.


The basic plastic extrusion blow molding machine regular maintenance items are the above.

These maintenance operations are for most blow molding machine equipment and are universal. The specific implementation depends on the use of the plastic blow molding machine equipment you use.

For more knowledge about blow molding machine equipment, welcome everyone to continue to pay attention to the official website of the Yankang blow molding machine to learn more about blow molding machine equipment issues.

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