★ Botou Ruicheng mechanical repair gear pump basic knowledge

Repair gear pump basic knowledge Gear pump wear parts are the main shaft and bushings, passive gear center hole and shaft pin, pump housing cavity and gear, gear end face and pump cover. Lubricating oil pump wear and tear of its main technical indicators fail to meet the requirements, it should disassemble, find out the location and extent of wear and tear, to take appropriate measures to be repaired. With the growth of the use of time, there will be insufficient gear pump oil pump, pump or even failure, mainly due to excessive wear and tear on the parts. Gear gear turnover gear gear wear is mainly in the tooth thick parts, and the gear face and addendum wear are relatively light. Gear teeth in the thick parts are unilateral wear, so the gear can be turned 180 degrees to use. When the gear surface wear, the end surface can be polished, while grinding the lubricating oil pump housing junction to ensure that the gap between the gear end face and the pump cover within the standard range. Pump chamber cavity repair: pump housing cavity wear, the general approach to repair the lumen set to be about to enlarging the inner cavity set with cast iron or steel bushings. After setting the sleeve, the cavity enamel to the required size, and wear out the end face of the bushing to make it flush with the combination of the pump housing. Seat Repair: Pressure limiting valve has two kinds of ball valve and plunger valve. Ball seat wear, the ball can be placed on a valve seat, and then gently tap the metal ball, until the ball valve and valve seat so close. If the valve seat is worn seriously, first remove the worn marks by reaming, and then use the method to make it close. Plunger seat wear, you can put a little valve sand grinding until close together. After the drive shaft and the bushing wear repair gear pump drive shaft and bushing wear, with the gap increases, will certainly affect the pump oil. In this case, you can repair the drive shaft or bushing method to restore its normal with the gap. If the drive shaft wear slightly, simply press the old bushing and put on the standard size bushing, with the gap can be restored to the allowable range. If the drive shaft and bushing wear serious and serious with excessive clearance, not only to replace the bushing, and the drive shaft also applies chrome or vibration welding method to increase its diameter, and then grinding to the standard size, recovery and bushing With the requirements. Repair of the oil pump housing Repair of the crack in the housing: Crack of the housing can be cast 508 nickel-copper welding electrode. Welds to be close and yuan stomatal, with the flatness of the pump cover with no more than 0.05 mm flatness. Drive shaft bushing hole and driven shaft wear and tear repair: Drive shaft bushing hole wear, the reaming method can be used to eliminate wear marks, and then with increased to the appropriate size of the bushing. Follower shaft wear and tear to wear and tear to eliminate traces of reaming method, and then press the hole reaming the actual size of the preparation of the driven shaft. Pump cover repair work plane repair: If the pump cover less wear and tear, manual grinding method can be used to eliminate wear marks, that is, put a little valve platform sand or thick glass plate sand, and then put the pump cover on the grinding until Wear marks removed, the work surface so smooth. When the pump cover working surface wear depth of more than 0.1 mm, should be taken after the turning grinding method to repair. Repair of drive shaft bushing hole: The repair of drive shaft bushing hole on pump cover is the same as repair method of wear of drive shaft bushing hole of housing.

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