1. Slurry pump cannot be started



First of all, the power supply should be checked: joint connection is reliable; Whether the switch contact is tight; Whether the fuse is blown; Whether the three-phase power supply is equal or not. In case of circuit break, poor contact, fuse fuse and phase missing, the cause shall be found out and repaired in time. Secondly, check whether the pump itself mechanical failure, the common reasons are: packing is too tight or impeller and pump body between debris stuck and blocked; Pump shaft, bearing, leakage ring rust; Pump shaft severely bent etc. Elimination method: relax the packing, dredge the flume; Disassemble the pump body to remove sundries and rust; Remove the pump shaft or replace it with a new one.



Two. Slurry pump does not work;



The solid sediments in the vortex shell are silted up.



Insufficient slurry pump flow;



If the impeller or the inlet and outlet water pipe are blocked, the impeller or the pipe can be cleaned. If the impeller wear seriously, should take the replacement. If the packing port leakage, should be compressed packing.



Slurry pump power speed is not matching or belt slip, so that the low speed; Axial flow pump blade installation Angle is too small; Insufficient head, too long pipe or pipe with right Angle; High suction range; Partial blockage of bottom valve, pipeline and impeller or impeller defect; The outlet pipe is leaking badly. Removal method: restore the rated speed, remove the belt grease, adjust the belt tightness; Adjust the blade Angle, reduce the pump installation position, shorten the pipeline or change the pipeline bending; Seal pump leakage, pressure packing; Remove the plug, replace the impeller; Replace the leak-reducing ring and plug the leaking place.



Pump vibration, noise;



There are mainly the following 5 reasons: (1) medium density is not uniform. Uneven medium density causes vibration when the pump is just started. When the pump is normally started, the vibration of the pump will disappear. This situation does not need to be dealt with. The installation of the pump is not horizontal. Check pump body level during installation and operation. There is cavitation, so that the pump impeller imbalance. The installation height should be reduced and the outlet valve should be adjusted to reduce the inlet resistance. (4) suction pipe intake is not uniform. The feed condition of pump should be improved to strengthen the uniform stability of air intake. (5) pump bearing clearance. Too large bearing clearance will lead to the vibration of the pump, in the daily operation of equipment should always pay attention to the observation of the pump situation (public number: pump pipe), found that the pump shaft and motor shaft different heart or bearing damage to be dealt with in a timely manner.



5. Slurry pump does not absorb water (not sizing)



There is air in the pump body or air accumulation in the inlet pipe, or the bottom valve is not closed tightly and the irrigation water is not satisfied, the vacuum pump packing is seriously air leakage, the gate valve or the flap door is not closed tightly. Exclusion method: the first water pressure, then the pump body filled with water, and then boot. At the same time, check whether the check valve is tight and whether there is leakage in the pipeline and joint. If air leakage is found, coat the joint with lubricating oil or adjusting paint after disassembly and tighten the screws. Check the oil seal ring of the pump shaft, and replace it with a new one if the wear is serious. Pipe leakage or air leakage. The nut may not tighten when installed.



If the leakage is not serious, in the leakage or leakage of the place daub cement, or coated with asphalt oil mixing cement slurry. Temporary repairs can be made with wet mud or soft soap. If the joint is leaking, you can tighten the nut with a wrench. If the leakage is serious, you must disassemble and replace the cracked pipe. Lower the head and press the nozzle of the pump into the water for 0.5m.



6. Leakage of packing



If the shaft and feed box different axis, the main reason is the processing error, the installation is not correct. Care should be taken to check whether the installation is correct after installation. If the sealing water ring is badly worn, a new water ring should be replaced. If the sealing water-cleaning pipe is blocked, the sealing water cannot enter the middle of the packing, resulting in quick wear of packing and material leakage. Dredge blocked pipes and keep sealed water clean.



Seven, slurry pump heat



Cause: bearing damage; Slurry pump rolling bearing or bracket cover clearance is too small; Pump shaft bending or two axis different center; Tape is too tight; Lack of oil or poor oil quality; The balance hole on the impeller is blocked, the impeller loses its balance and increases the thrust to one side. Elimination method: replace the bearing; Remove the back cover and install gasket between the bracket and the bearing seat; Investigate pump shaft or adjust the concentricity of two shafts; Appropriately adjust the belt tightness; Add clean butter, which accounts for about 60% of the bearing internal clearance; Clear the plug in the balance hole.



Overheating of supporting power motors



First, power supply reasons: slurry pump voltage is high or low, under a specific load, if the voltage range should be within the rating value of + 10% to -5% will cause motor overheating; The three-phase voltage of the power supply is not symmetrical, and the phase imbalance of the three-phase electric voltage of the power supply exceeds 5%, which will lead to overheating of the winding. Phase-deficient operation, experience shows that more than 85% of the burns of agricultural motors are caused by phase-deficient operation, so phase-deficient protection devices should be installed on the motors.



Reason two, is the pump reason: the power is not matching, small horse cart, electric long time overload operation, so that the motor temperature is too high; Start too frequently, the quota for a short time or intermittent work system of motor continuous work. The number of starting times should be limited, the correct choice of thermal protection, according to the motor calibration quota.



Reason three, is the motor itself: connection error, will misconnection Y shape, make the motor temperature rapidly rising; Stator windings have phase to phase short circuit, inter-turn short circuit or local grounding, light when the motor local overheating, serious insulation burned out; Cage rotor bar broken or defective, motor operation 1 to 2 hours, iron core temperature rises rapidly; If the ventilation system fails, check whether the fan is damaged, whether the rotation direction is correct, and whether the vents of slurry pump are blocked. Bearing wear, rotor eccentric scavenging makes the rotor core phase rub metal percussion sound, iron core temperature rises rapidly, serious motor smoke, even coil burn out.



Reason four, is the work environment aspect reason: the electric motor winding is affected with damp or the dust, the greasy dirt and so on adheres on the winding, causes the insulation to reduce. The insulation resistance of the motor shall be measured and cleaned and dried. The ambient temperature is too high. When the environment temperature more than 35 ℃, inlet air temperature is high, can make the temperature of the motor is too high, should try to improve their working environment. If build shade, etc. Note: if there is a fault due to electrical reasons, please ask the electrician who has obtained the professional qualification certificate for maintenance. People with a little knowledge should not repair blindly to prevent the occurrence of personal injury accidents.



Nine bearing heating



There are mainly the following 5 reasons: (1) did not open the cold water or cooling water tank blocked, should open the cooling water function or dredge cooling channel. (2) equipment lubrication is not good. The amount of lubricating oil should be adjusted according to the instruction. The lubricating oil is not clean, there are impurities in the oil. Bearings should be cleaned and lubricants changed. The thrust bearing direction is wrong. Adjust thrust bearing direction according to inlet pressure. (5) the bearing outlet is blocked, resulting in hot air in the bearing box can not be discharged, so that the temperature of the equipment. Air outlets should be cleaned.



Ten bearing life is short



There are four main reasons: (1) motor shaft and pump shaft is not symmetrical or parallel. The motor shaft or pump shaft should be adjusted. If the shaft is deformed or bent, replace the shaft directly. (2) bearing assembly is not reasonable. Install the bearing and axle load, or replace the bearing. (3) pump friction or impeller lost balance. Friction should be removed or a new impeller replaced. (4) bad lubrication. Too much or too little impurity will lead to short life of the bearing, the bearing should be removed and cleaned before use.