Operating Procedures for Bridge Scraper
Operators should be familiar with the structure and working principle of the bridge scraper.
Ensure that the motor power cord is connected correctly and the supply voltage is normal.
Before starting, check the shift log and the indicator switches on the on-site control cabinet.
Check the machine's operation every hour. If any abnormalities occur, stop the machine immediately for inspection. There should be no abnormal noise from the bearings during operation, and the temperature of the rolling bearings should not exceed 70℃, with a temperature rise not exceeding 40℃.
Under normal circumstances, the machine should operate continuously. If it needs to be stopped, first stop the sewage intake, and wait for the scraper to rotate one full revolution before stopping to prevent sludge accumulation at the bottom of the pool.
If the pool surface freezes in winter, the scraper cannot operate. It can only be used after the ice is manually broken.
Before starting any maintenance or repair work, disconnect the main power switch and ensure that it cannot be started by others.
Maintenance Procedures
Regularly observe the sediment and sedimentation rate in the tank to determine the downtime and ensure that sludge accumulation does not exceed a certain period.
Inspect all collecting devices every two weeks to ensure good contact between the brushes and the collector rings. Replace severely worn parts promptly.
Conduct a complete machine inspection and maintenance annually. Replace worn parts, retighten all fasteners, and reapply anti-corrosion agent to rusted areas.
Regularly lubricate the motor, reducer, wheel bearings, and center swivel support with clean, impurity-free oil or grease as required.
Motor: Add ZN-2 calcium-sodium based grease annually.
Wheel Bearings: Add ZN-2 calcium-sodium based grease every six months.
Reducer: Replace with CLP220 gear oil every six months.
Center Swivel Support Bearing: Add HJ-30 machine oil weekly.
Preparations Before Operation of Sludge Dewatering Equipment
Before starting, check the following:
(1) Whether the centrifuge is installed correctly and completely.
(2) Whether the monitoring equipment is complete and fully functional.
(3) Whether the material passage is properly set up.
Flocculant Preparation:
(1) Ensure that the flocculant concentration required for sludge treatment is prepared 30 minutes before operation.
(2) Check the flocculant dosing pump (shaft seal, connecting shaft).
(3) Check the flocculant flow meter and pressure gauge.
(4) Check the dilution water system (equipment, pressure).
(5) Check whether the valves on the flocculant dosing pipeline are in the correct position.
Sludge Preparation:
(1) Ensure that there is enough sludge in the homogenizing tank/buffer tank, at least 1.5/1.3 meters deep.
(2) Check the submersible agitator.
(3) Check the level gauge.
Sludge Treatment System Preparation:
(1) Check the cutting machine: lubricating oil level, reliable protective devices, no looseness, no cracks, and front and rear valves are in the open position.
(2) Check the sludge dosing pump: shaft seal, connecting shaft, dry running protection wiring.
(3) Check the sludge flow meter and pressure gauge.
(4) Check the flushing water system (equipment, pressure).
(5) Check whether the valves of the sludge dosing pipeline and flushing water pipeline are in the correct position.
(6) Check the centrifuge: bearing lubrication system, motor support device, main and auxiliary motors, drum protection device, thickener outlet gate valve, and screw conveyor.
Start-up
Directly use the thickener for dewatering (manual operation of each interface in the PLC control system):
Open the thickener outlet gate valve → centrifugal thickener → (after the centrifuge reaches normal speed) → flocculant dilution system → flocculant dosing pump → cutter → sludge dosing pump → screw conveyor.
First thicken, then dewater (in PLC control) (manual operation of each interface in the system):
Close the outlet gate valve of the thickener → Centrifugal thickener → (After the centrifuge reaches normal speed) → Flocculant dilution system → Flocculant dosing pump → Cutter → Sludge dosing pump → (After the buffer tank level reaches 1.3 meters) → Submersible agitator → Centrifugal dewatering machine → (After the centrifuge reaches normal speed) → Flocculant dilution system → Flocculant dosing pump → Sludge dosing pump → Screw conveyor.