Along with the improvement of the use time, the common faults such as insufficient or no oil valve of the gear pump, the key is that the relevant parts are worn too much. The wear parts of gear pumps are mainly driving shaft and sleeve, passive gear management center hole and pin shaft, pump body wall and gear, gear inner hole, pump cover, etc. After the lubrication pump is worn out, if the main performance index fails to meet the requirements, it should be disassembled to find out the worn part and level, and use an effective method to restore it.

 

　　1. Repair of driving shaft and bushing after wear

 

　　After the drive shaft and sleeve of the gear pump are worn out, the gap will expand, ultimately endangering the amount of the oil valve. In this case, all normal clearances can be restored by repairing the movable shaft or sleeve. If the movable shaft is slightly worn, press down the old sleeve and replace the standard size sleeve. As long as the clearance fits, it can be restored to an acceptable category. The movable shaft and the sleeve are seriously worn and the gap is too large. Not only must the sleeve be removed, but also the diameter of the stainless steel or vibration spray welding method must be used to increase the diameter, and then cut to the standard size, and the maintenance and the sleeve must be coordinated.

 

　　2. Repair of the lubrication pump housing. Cover crack repair: Cover cracks can be welded with cast 508 nickel tin electrode. The welding is inseparable, and the reason for the flatness deviation of the fusion surface with the far out hole and the pump cover does not exceed 0.05 mm.

 

　　Repair of driving shaft sleeve hole and driven shaft wear: After the driving shaft sleeve hole is worn, use a hinge to remove the wear marks, and then apply the sleeve added to the relative specification. The driven coaxial wear also uses the hinge to remove the wear marks, and then configures the inner wall of the driven pump for maintenance according to the specific specifications of the rear hole of the hinge. After the wall of the pump body is worn out, it is generally repaired by the inlay method of the inner wall. After the inner wall is greatly frozen, the pig iron or steel sleeve is clamped. After putting on the lasso, freeze the inner wall to the specified specifications, and grind the sleeve of the inner hole to make it the same height as the fusion surface of the pump.

 

　　High-pressure gate valve maintenance: pressure reducing valves include ball valves and plunger pump valves. After the ball-type high-pressure gate valve is worn, place the bearing ball on the high-pressure gate valve, and then gently tap the bearing ball with a metal rod until the gate valve and the high-pressure gate valve are sealed. If the high-pressure gate valve is severely worn, you can first use a hinge to remove the scratches, and then use the commercial method to seal it. After the piston pump type high pressure gate valve is worn out, a small amount of cylindrical sand can be added to grind until the tightness is achieved.

 

　　3. Pump cover repair

 

　　The maintenance of the working floor plan: If the floor plan is worn out during the pump cover work, manual grinding can be used to remove the abrasion marks. In other words, remove a small amount of cylinder sand on the service platform or thick glass, then place the pump cover on it and grind it until the wear marks are removed. The surface became flat during work. During the operation of the pump cover, if the surface wear depth exceeds 0.1mm, it must be milled first and then restored by milling.

 

　　Movable shaft sleeve hole repair: The method of repairing the wear of the movable shaft sleeve hole of the pump cover is the same as that of the casing hole.

 

　　Four, gear rotation application

 

　　The core of gear pump gear wear is the thick part of the tooth, and the wear of the gear inner hole and mesh angle is relatively light. The gear is worn on one side in the thick part of the tooth, so the gear can be rotated 180 degrees for application. After the inner hole of the gear is worn, the inner hole can be ground, and the fusion surface of the pump casing can be ground to make the gap between the inner hole of the gear and the pump cover within the specification range.