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Talking about the hydraulic pump cylinder and plunger repair knowledge: Inspection of cylinder wear, often all parts of the pump body removed, and after cleaning, drying, you can see the signs of wear. More serious wear, the fingers can touch the feeling; In addition, the plunger (standard size plunger better) into the corresponding hole, left and right hands were to catch the upper and lower ends of column cold, it can be pressed to According to experience to determine the approximate value of wear. If the conditions permit with 25mm below the probe diameter dial indicator, the cylinder bore size, taper, ovality tolerance state completely measured and recorded. The principle of repairing the plunger pair is to process the inner wall of the cylinder bore to a minimum new acceptable condition, and then, with the increased size plunger qualified by shape and surface roughness to maintain the specified running clearance, Form a new well-sealed working cavity. JBZ-01B-type pump off the cylinder, usually by extension steel forging, annealing, quenching and processing after manufacturing. If the cylinder bore is only quenched and tempered after the hardness is not too high, the repair cylinder bore reamer can be used for special cutting reamer, because the existence of the eccentric cylinder installed in the top of the shaft up to φ176 space (see Figure 3-5), it can also be used to adjust the active reamer for flexible dumplings. If the cylinder bore wall material has been quenched by high frequency, hardness up to HRC50 or more, only the use of Qi mill or grinding method to deal with. Due to conditions, the use of units, generally can be used to manually grind to be resolved. Regardless of reaming or grinding, in order to avoid cutting tools, abrasives due to weight and other factors on the cylinder few one-sided cutting, repairing the processing cylinder bore, the cylinder should be clamped in the straight iron, and the processing of the cylinder bore Ding vertical vertical position. A cylinder bore grinding is completed, a little loose clamp screw, the cylinder affixed to the right-angle iron on the turn, the next cylinder hole to be machined to the vertical vertical position, tighten the screw, that is New reaming or grinding can be performed to repair the cylinder bore. Figure 3-10 is the case of manual grinding. The grinding rod used to repair the plunger hole of the cylinder should be 0.01 ~ 0.025mm smaller than the inner diameter of the plunger hole before the outer diameter of the semi-fine grinding. The material of the grinding rod is usually made of a material that is slightly softer than that of the grinding workpiece, usually made of gray cast iron, mild steel and the like.
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