1, the buffer tank In order to pump work has a stable pressure, flow, pump inlet and outlet tubes are equipped with buffer tank. The buffer tank must be prefilled with nitrogen to a certain degree. The pre-charge pressure can in principle not be less than 30% of the maximum working pressure and 80% of the minimum working pressure. Although higher pre-charge pressure produces a better cushioning effect, pulsations occur when the pressure drops and frequent impact on the bottom of the tank results in damage to the metal inner part. When the working pressure range is large, only the pre-charge pressure is required to be 30% ~ 35% of the maximum working pressure. The pre-charge pressure provided by the diaphragm pump manufacturer is as follows: the pre-charge pressure of the inlet buffer tank is between 80% and 90% of the inlet pressure, Export buffer tank pre-charge pressure to the outlet pressure of 60% to 65%. In actual operation, the vibration of the inlet pipe of the pump is large, indicating that the pre-charge pressure of the inlet buffer tank is not suitable. According to the actual situation, the pre-charge pressure of the inlet buffer tank is reduced to 60% -65% of the inlet pressure, and the vibration is immediately eliminated. Resume normal working condition. Pump in the operation process, due to leakage and other reasons buffer tank pressure will slowly decline to a certain pressure, the pump appears unstable and accompanied by abnormal sound observed at low pressure for a long time to run, the diaphragm is always large Range fluctuations, easy to make the diaphragm fatigue, reduce the service life of the diaphragm. To overcome this situation, the buffer tank must be punched in operation. According to the pump in the debugging process and the normal production of accumulated experience, decided to load operation to the buffer tank stamping, pressure gauge pointer to stabilize the pressure to achieve a successful sign, several tests have achieved good results, to ensure that the pump Long period of safe operation. 2, Exhaust 1) Water injection Exhaust slurry water injection chamber has two purposes: â‘ liquid exhaust. Through the connection in the import pipeline flushing water control valve and outlet pipe on the drain valve to complete the coal slurry chamber exhaust; â‘¡ promote the automatic addition of liquid. The original filling of the water will force the diaphragm to move toward the back of the diaphragm chamber, which automatically fill the position. In order to obtain sufficient hydraulic pressure to promote the diaphragm to this position, the opening of the drain valve on the outlet pipe can be controlled to complete the automatic filling. Water injection is the most critical water pressure control, pump manufacturers to provide the pressure of 013MPa, the actual operation of the general control of 0128 ~ 0135MPa, too high, too low will make the promotion liquid cavity oil injection too much or too little, leaving the diaphragm in the Injured during operation. 2) The purpose of oiling and exhausting is to push the liquid chamber for oiling. The filling process is carried out continuously and automatically. During filling, the vent valve must be kept open until there is no air when the pumped liquid is discharged. At this moment, the control rod has been removed from the triggering position and within one minute, the filling process is stopped automatically. The pusher chamber is full at this point, but for the piston, the diaphragm has not reached the proper position, which will be done by the crank. The manufacturer recommends filling the liquid by manual turning, but the manual turning is not only time-consuming and laborious, but also difficult to make the liquid filling cavity to the best state. Therefore, the low-load starting pump is used instead of the manual turning to complete the filling of the liquid chamber Liquid, start the low load selected as 10%. 3) Normal operation of the exhaust pump in normal operation, due to the dissolved gas in the propulsion fluid, seal leakage and other reasons, so that the gas in the pumped liquid chamber more set more, the diaphragm will be damaged, should be regularly on the promotion of liquid chamber Exhaust. 3 Propulsion Fluid Control System Under normal operating conditions, the magnet on the lever moves with the lever between ZSH and ZSL and the trigger is not triggered. If too little propellant in the pusher chamber, the magnet will move to the trigger ZSL and the trigger will output a pulse to the PLC control box. The PLC will output a signal to open the filler valve HV1, 2 or 3 and push the liquid into the pusher chamber. If the propulsion liquid too much propulsion liquid, the trigger ZSH also output a pulse signal to the PLC control box, this time the discharge valve HV5, 6 or 7 is open, the propulsion liquid will be discharged propulsion liquid chamber. If the propulsion fluid system is faulty, the charge or discharge valve continues to energize for more than 3 minutes and the PLC will output a fault signal. The above injection of liquid injection is automatically discharged, but the pump occurred in the run-up due to triggers, internals and other reasons that automatic liquid injection process out of control, to overhaul only parking treatment, in order not to bring loss of production, After careful consideration, the decision to use manual injection of oil, due to lack of experience, the first injection, the promotion of liquid chamber on the exhaust valve is not open, leading to too much filling liquid, so that the diaphragm is damaged. On the basis of summing up the experience of failure, manually re-oiling, open the exhaust valve to promote the cavity discharge stroke pressure is stable as a sign of fullness. Several tests have been successful, providing a guarantee for safe and continuous production. 4 open parking load diaphragm pump is driven by the variable frequency motor, if the parking load is too large or too small, short-term load fluctuations, long-term operation at low load and so on have an impact on the inverter, in order to avoid the above situation , The mandatory provisions of the open parking load is controlled at about 30%, and set in the instrument to increase or decrease the load must be completed within a period of time, effectively from the craft done on the inverter maintenance. 5 Instrument air and oil pressure Instrument air and oil pressure are interlocked with the main motor to promote liquid oil, oil drain valve for the gas valve, to always maintain a certain air pressure, the minimum pressure of the two valves is not working Less than 0.4MPa, so the instrument air pressure is generally maintained at above 015MPa, stop the meter air even after stopping the pump, so as not to promote the liquid in the liquid chamber is not enough or excessive, the air supply valve is filtered, oil atomized. Pump operation, the lubricating oil pressure should not be less than the pressure interlock value (0115MPa), and the oil outlet filter pressure can not be too large, lubricating oil flow within the scope of the ball should be in the upper limit position, when adjusting this flow Adjust the amplitude can not be too large, so as to avoid the moment Ambassador flow pressure drop too fast cause interlocking jump. Through the above process improvement and mastering the operation essentials, the pump will always have a stable operation environment. After more than one year of operation, it has only one trip due to electrical reasons and has achieved long cycle, safe and efficient operation.
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