Processing Machinery
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HDPE Municipal Manhole Ring
Problem Phenomenon
Inspection manhole ring deforms after heavy loading
Cause Analysis
Vehicle rolling loads are large, and ordinary HDPE has insufficient rigidity; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Select high-rigidity reinforced grades for the manhole ring; add ribs to the structure; test load according to municipal standards; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Municipal parts are verified according to standard loads; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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