Gear Pump Repair Common Sense

The repair knowledge of gear pump with the improvement of the use of time, gear pump will show the lack of pump oil, even oil and other problems, the main reason is that the relevant parts wear too much. Gear pump wear parts mainly include automatic shaft and bushing, passive gear intermediate hole and shaft pin, pump shell cavity and gear, gear end face and pump cover. When the primary skill target of the smooth oil pump fails to meet the requirements after wear, it should be disassembled and differentiated to find out the wear parts and levels, and adopt the response method to repair.

Repair of Automatic Shaft and Bushing After Wear

Gear pump automatic shaft and bushing wear, the common clearance increases, will affect the amount of oil pump. The normal common clearance can be restored by repairing the automatic shaft or bushing. If the automatic shaft wear fine, just press out the old bushing after the bushing of the standard size, the common clearance can be restored to the limit. If the automatic shaft and bushing wear severe and common clearance severe exceed the standard, not only change the bushing, and the automatic shaft also use chrome plating or vibration surfacing method to increase its diameter, and then grinding to the standard size, restore the common requirements with hydraulic bushing.

Repair of Smooth Oil Pump Shell

Cracks in the shell can be repaired by casting nickel-copper electrode. The weld shall be tight and porous, and the flatness error of the connecting surface with the pump cover shall not be greater than 0.05 mm. Automatic bushing hole and driven shaft hole wear repair: automatic bushing hole wear, can be hinged to eliminate the wear trace, and then with increased to the response size of the bushing. Driven shaft hole wear is also hinged to eliminate wear, and then according to the practical size of the hinged hole to prepare the repair of the driven shaft pump shell cavity: after the wear of the pump shell cavity, the general acceptance of the inner cavity insert method repair, the single machine dust collector will be lined up the inner cavity and then insert cast iron or steel bushing. After the casing, the inner cavity is honed to the required size, and the bushing out of the end face is ground away so that it is flush with the connecting surface of the pump housing. Repair of valve seat: pressure limiting valve has two kinds: ball valve and plunger valve. After the ball seat is worn, a steel ball can be placed on the seat and quietly tapped with a metal rod until the ball valve is close to the seat. If the valve seat is severely worn, it can be hinged to remove the wear mark and then used to make it close. After the plunger seat is worn, a little valve sand can be put in for grinding until it is closed.

Pump Cover Repair Task Plane Repair

If the pump cover task surface wear is small, the manual grinding method can be used to eliminate the wear signs, that is, put a little valve sand on the platform or thick glass plate, and then put the pump cover on the surface for grinding until the wear signs are eliminated and the task appearance is flat. When the wear depth of the pump cover task plane exceeds 0.1mm, the method of turning before grinding should be accepted for repair. Repair of automatic shaft bushing hole of dust collector bag cage: Repair of automatic shaft bushing hole wear on pump cover is the same as repair of shell automatic shaft bushing hole wear. Four, gear turnover using gear pump gear wear is mainly in the tooth thickness, and gear end face and tooth top wear are relatively light. Gear in the tooth thickness parts are unilateral wear, so the gear can be turned 180 degrees. When the end face of the gear is worn, the end face can be ground flat, and the connecting surface of the oil pump housing can be ground smooth, so as to ensure that the clearance between the end face of the tube gear and the pump cover is within the specification limits.