As this slurry pump in the process of our plant as a key equipment, responsible for the slurry sent to the swirler, so the status of its operation is directly related to product quality indicators, production and production can continue. Common Faults During the process of using the slurry pump in my ore dressing plant, the following faults often occur: the oil temperature of the fluid coupling is relatively high (about 70 ° C); the normal temperature is about 50 ° C (inlet oil temperature); Pump suction insufficient, while the motor current is high, about 180A (normal 150A or so), resulting in slurry into the swirler in the pressure is small, the cyclone grading effect is not ideal, affecting the product index; Large (especially for high-sulfur mine), the motor current often reach above 190A and cause the motor to trip. After such repeated use for about one year, once in use, it was found that the fluid coupling fluid temperature of the sand pump continued to abnormally increase in temperature (6 ° C / min), abnormally high temperature (oil was boiled), and eventually Lead to more than 190A current trip, after repeatedly failed to start. After careful interrogation of the operator and careful examination, the cause of this problem is considered as follows: The squad leader thinks the amount of oil in the fluid coupling is too small and adds a barrel (about 170L) of 150 # machine oil (originally used as 100 # Mechanical oil), exceeding the highest level of hydraulic coupling oil about 20mm. In exchange for 8 # hydraulic transmission oil, and to join the amount of oil control in the highest level below about 1mm, after nearly a month of operation, It is found that the motor current is stable between 130 ~ 150A; the oil temperature in the hydraulic coupling is about 60 ℃; the hydrocyclone grading effect is better; the sand pump tripping phenomenon is obviously reduced. Hydraulic coupling is equivalent to the combination of centrifugal pump and turbine. When the motor drives the pump impeller through the input shaft of the coupler, the pump impeller such as a centrifugal pump causes the working oil in the working chamber to flow along the flow path of the impeller from the inner edge, After flowing out, the liquid flows through the gap between the impeller and the impeller to impact the impeller to drive the impeller so as to convert the kinetic energy of the liquid into the mechanical energy of the output shaft like a turbine. Then, the liquid flows back through the impeller inner flow path The pump wheel, starting the next cycle, transfers the energy of the motor to the working machine flexibly. During the operation of the coupling, the main circulation pump sucks in the working oil in the coupling tank, enters the oil inlet chamber in the conduit casing through the cooler, and enters the working chamber through the oil inlet of the pump, and at the same time, Fluid leaks into the housing (spoon tube chamber) from the pump drain hole to form a rotating oil ring. In this way, the speed governing device (electric actuator and rod system) can be used to steal the scoop tube to change the thickness of the oil ring in the housing, that is to change the amount of oil in the working chamber to realize the stepless regulation of the output speed, The oil from the catheter goes back to the tank through the oil drain. Therefore, when using 100 # mechanical oil (requires the use of 8 # hydraulic transmission oil), the fuel tank temperature will rise, the output kinetic energy will be reduced, resulting in reduced pump capacity, eventually resulting in the aforementioned sand pump failure. In addition, when the amount of oil is added too much, the rotating rod in the fluid coupling will produce considerable friction with the oil, causing severe overheating of the oil temperature, which is why the boiling of oil occurs after 170L150 # mechanical oil is added main reason.
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