1. Operate the cylinder piston to advance or retreat a few centimeters at a time, gradually reaching the desired position through multiple adjustments.
2. If the piston moves forward excessively due to carelessness, pushing the concrete piston deep into the cylinder, insert a piece of square timber into the concrete cylinder from the S-tube cavity and use a jack to push the piston into the water tank.
3. Pre-lubricate the pipeline with water and diluted mortar before spraying concrete through the nozzle.
4. Strictly control the concrete mix ratio and ensure proper distribution during transportation. Equip transport vehicles with their own mixing functions to maintain consistency.
5. Maintain adequate hydraulic oil levels and ensure high purity.
Some practical insights on addressing pipe blockages in concrete pumps:
Operators must stay focused during pumping. Always check the quality of concrete at the mixer truck discharge before pumping. Avoid pumping substandard concrete and rectify issues promptly.
Monitor pressure readings constantly. If the pressure gauge spikes unexpectedly, reverse pump 2-3 strokes immediately. Continue pumping only if the issue is resolved. Otherwise, remove and clean the pipe to prevent further blockages.
Proper pumping speed is crucial. Start with a low speed during initial pumping to overcome pipeline resistance. Increase speed once flow stabilizes. Slow down again if blockage signs appear or slump decreases.
Observe hopper material levels closely. Residual material must remain above the agitator shaft. Excessively low levels can draw in air, causing blockages.
Avoid overloading the hopper. Keep material below the guardrail for easier removal of coarse aggregates. Adjust levels based on slump to reduce resistance.
If concrete stiffens prematurely, do not force it through the line. Drain the hopper and address the issue instead. Adding water can worsen blockages.
During pauses, run the pump every 5-10 minutes to keep lines clear. Avoid pumping set or partially set concrete.
After each session, clean the lines thoroughly to prevent future blockages.
Common causes of blockages include poor concrete quality, pipe leaks, tight bends, and operational errors. Prevention is key – focus on quality control, regular maintenance, and attentive operation.
In case of blockages, try reversing the pump first. If unsuccessful, locate the blockage by listening for vibrations and knocking sounds. Disassemble affected sections immediately if necessary, prioritizing quick cleanup to avoid concrete hardening.
This comprehensive approach helps minimize downtime and ensures efficient pumping operations.
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