Membrane diaphragm easy to cause bad diaphragm diaphragm design life of 8000h, working pressure 6MPa, in the process of import and export materials, diaphragm left and right were stressed, up to 4800kN, due to continuous by the role of alternating force, easy to damage Cracking diaphragm diaphragm easily damaged in the following areas: ①due to a certain volume of the diaphragm chamber, if the feed is unstable, the pressure is low, the feed compensator level below 12m, regulator device level is not Normally, when the material is fed, the slurry in the pump separates to form a gap, resulting in lack of material and emptying the pump, resulting in hammering or impact or even cavitation, increasing the stress to which the diaphragm is subjected and increasing the frequency, resulting in fatigue damage or breakdown of the diaphragm. ② diaphragm chamber air is not drained, the gas volume changes with the advance of the hydraulic pressure changes, the formation of gas hammer, membrane partial force increases, the diaphragm broken. ③ feed temperature exceeds the specified 100 ℃, to accelerate the diaphragm aging, at the same time, the steam bubbles generated in the slurry, the gas into the diaphragm chamber or unloading valve leakage, the hydraulic pressure to reduce, are caused by uneven diaphragm force, fatigue damage. ④ feed contains 3-8mm stones or large pieces of material and the slurry of solid mass percentage of more than 2. %, Causing the card valve, causing the pump pressure fluctuations, or because the valve assembly, the valve cone positioning is not allowed, causing the thorn valve, leading to instant diaphragm force increased; cause rupture. ⑤ diaphragm chamber feed and discharge through the probe detection lever position times the number of control, if the magnetic ring on the control rod weak, the probe can not detect the signal, can not make timely discharge of oil, resulting in diaphragm unilateral stress Big and broken. ⑥ diaphragm control rod bearing wear serious, so that the control rod eccentric, sinking, diaphragm force increases, easy to crack the diaphragm. ⑦ unit pressure, causing pneumatic diaphragm overpressure, diaphragm withstand instantaneous increase caused by rupture. ⑧ crosshead, piston or cylinder liner loose, crosshead guide, crosshead bearing installation is not correct, causing the piston hammer, will make the hydraulic imbalance; frequent pump jump stop, will make the diaphragm instantaneous force to reach the limit, Cause the diaphragm rupture. ⑨ nitrogen bag pre-filled with 2.2MPa of nitrogen, a better damping effect. During operation, the pressure reflected on the pressure gauge is the operating pressure instead of the nitrogen bag pressure (visible only when the pump is stopped). If the nitrogen bag is damaged or the pressure is reduced during operation, the diaphragm pump operates without damping and will result in Hydraulic imbalance, diaphragm easy to crash and damage. ⑩ diaphragm itself poor quality, inelastic, low-strength materials.
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