Gear Pump Maintenance and Development Direction

Daily Maintenance

We can not avoid the wear of the gear pump when using the gear pump, so there will be many problems, so we should learn the most common maintenance technology of the gear pump. With a problem to make an accurate judgment on it, I will tell you about the most common maintenance technology:

Maintenance of Working Surface

If the pump cover working surface wear is relatively small, you can eliminate wear marks by grinding yourself, 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 marks are worn off, the working surface is smooth. If the working surface of the pump cover wear depth of more than one millimeter, it is necessary to take the first turning in the grinding of maintenance.

Maintenance of Driving Shaft Bushing Hole

The repair method of driving bushing hole wear on pump cover is the same as that of housing driving bushing hole wear.

Repair of the inner cavity of the pump shell: after the inner cavity of the pump shell is worn, it is repaired by the inner cavity insert method, that is, the inner cavity is lined with cast iron or steel bushing. After lining, honing the inner cavity to the required size, and grinding the bushing out of the end face, to be flush with the pump casing joint surface.

Seat Repair

There are two kinds of pressure limiting valves: ball valve and plunger valve. After the ball seat is worn, a steel ball may be placed on the seat and gently tapped with a metal rod until the ball valve is close to the seat. If the seat is badly worn, it should be hinged to remove the wear marks and then used to make it close. After the plunger seat is worn, a little valve sand can be put into the ground, grinding until close.

The above is for the most basic parts of the gear pump maintenance, we may encounter other aspects of different problems in the process of application, we also have to seriously explore these different problems to find out the cause of the problem.

Development Direction

As a main type of pump, gear pump has undergone a lot of important development changes. Early gear pumps are fully hydraulic, due to the need for environmental protection and energy saving, as well as the mature application of servo motor and the price of a significant decline, in recent years, more and more electric precision gear pumps, in order to analyze this development trend, I will list the comparative characteristics of this:

Full hydraulic gear pump has many unique advantages in forming precision, complex shape products, it from the traditional single cylinder filling type, multi-cylinder filling type to two plate direct pressure type, which is the most representative of two plate direct pressure type, but its control technology is difficult, high machining precision, hydraulic technology is also difficult to master.

Electric-hydraulic gear pump is a set of hydraulic and electric drive in one of the new gear pump, it integrates the high performance of the full hydraulic gear pump and the full electric energy saving advantages, this combination of electric-hydraulic gear pump has become the technical development direction of gear pump.

According to the requirements of gear pump equipment technology, the power consumption of gear pump, oil pump, motor accounts for as high as 50%-65% of the power consumption of the whole equipment, so it has great energy saving potential.

Gear pump rotation is not smooth reasons:

1. Too small axial clearance or radial clearance. Re-adjust and repair.
2. There is dirt in the pump. Disintegrate to remove foreign matter.
3. Incorrect assembly. The processing datum of the two pin holes of the gear pump is not the datum of the assembly. If the pin is driven in first and then the screw is tightened, the pump will not move. The correct method is to tighten the screw while rotating the gear pump, and finally match the drill pin hole and drive the pin.
4. The concentricity difference between pump and engine coupling. The coaxiality should be guaranteed within 0.1mm.
5. The parts in the pump are not demagnetized. All parts must be demagnetized before assembly.
6. The quality of the needle rolling sleeve is unqualified or the needle rolling is broken. Repair or replace.
7. The working oil outlet is blocked. Remove foreign bodies.