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Gear pump repair knowledge
Sep 06, 2018

The repair knowledge of the gear pump is followed by the improvement of the use of time. The gear pump will present a lack of pump oil or even oil. The main reason is that the relevant parts are excessively worn. The wear parts of the gear pump mainly include automatic shaft and bushing, passive gear intermediate hole and shaft pin, pump casing inner cavity and gear, gear end face and pump cover. When the primary skill target of the smooth oil pump fails to meet the requirements, it should be disassembled and differentiated, the wear parts and levels should be ascertained, and the response method should be accepted for repair.

1. After the automatic shaft and bushing are worn, the automatic shaft and bushing wear and tear, and the common clearance increases, which will affect the pump's oil quantity. Automated shafts or bushings can be used to restore their normal common clearance. If the automatic shaft wears out slightly, just press the old bushing and replace it with the bushing of the standard size, and the common clearance can be restored to the limit. If the automatic shaft and bushing wear is severe and the common clearance is severe, the bushing is not changed, and the automatic shaft is also chromed or vibrated to increase its diameter, and then ground to the specified size, recovery and bushing. Common requirements.

Second, the repair of the crack of the repairing shell of the smooth oil pump casing: the crack of the shell can be repaired by casting 508 nickel-copper welding rod. The weld must be tight and the air hole, and the flatness error of the connection with the pump cover is not more than 0.05 mm. Repair of the automatic shaft bushing hole and the driven shaft hole wear: After the automatic shaft bushing hole is worn, the wear scar can be removed by reaming, and then the bushing is enlarged to the response size. The driven shaft hole wear also eliminates the wear scar by the reaming method, and then repairs the inner cavity of the driven shaft pump casing according to the practical size of the reamed hole: after the inner cavity of the pump casing is worn, the ordinary receiving cavity is fixed by the socket setting method. The single-stage dust collector is equipped with a cast iron or steel bushing after the inner cavity is enlarged. After the insert is set, the inner cavity is pulled to the required size, and the bushing of the extended end face is ground to make it flush with the pump casing. Valve seat repair: The pressure limiting valve has two kinds of ball valve and plunger valve. After the spherical seat is worn, a steel ball can be placed on the valve seat, and then the steel ball is slammed with a metal rod until the ball valve is in close contact with the valve seat. If the seat is severely worn, it can be reamed to remove the wear marks, and then the upper method is used to make it close. After the plunger seat is worn, a small amount of valve sand can be placed for grinding until it is tight.

Third, the repair of the pump cover repair plane: If the pump cover task plane wear is small, you can use the manual grinding method to eliminate the wear and tear, that is, put a little valve sand on the platform or thick glass plate, then put the pump cover on it for grinding Until the wear and tear disappears, the task looks flat. When the pump cover task plane wear depth exceeds 0.1 mm, it should be repaired by first turning and grinding. Repair of the automatic shaft bushing hole of the dust collector bag: The repair of the automatic shaft bushing hole on the pump cover is the same as the repair of the automatic shaft bushing hole of the housing. Fourth, gear reversal gear gear gear wear is mainly in the tooth thickness part, while the gear end face and the tooth top wear are relatively light. The gear is worn on one side in the tooth thickness, so the gear can be turned 180 degrees. When the gear end face is worn, the end surface can be flattened, and the smooth oil pump casing connection surface is also grounded to ensure that the gap between the gear end face and the pump cover is within the specification limit.