Analysis of several common faults and causes in the use of axial piston pump
After working for a long time, or improper operation and maintenance, the
axial piston pump often fails. Now Hengyu hydraulic briefly introduces several
common failures and causes analysis of the axial piston pump.
1. Insufficient output flow or no oil at all: large suction resistance or air
intake; poor bearing capacity of shaft; damage of return spring or return plate;
dirt between port plate and cylinder block; damage of plunger or plunger plug
hole; wrong position of variable mechanism; too high oil temperature; poor
assembly.
2. The pressure is not raised or not at all: the above-mentioned
insufficient flow may be caused; the variable mechanism is not adjusted
properly; other reasons.
3. Large pump noise and pressure fluctuation: air
intake; inflexible movement of variable piston; too small angle of triangular
groove; small rigidity of variable mechanism; loose fit of sliding shoe and ball
head; large leakage of variable mechanism.
4. Pump heating and high oil
temperature rise: the piston and plug hole, the junction surface of port plate
and cylinder block are worn, with large leakage; the movement pairs in the pump
are seriously worn and roughened, with low mechanical efficiency; the pump has
small eccentricity or low working pressure; the oil viscosity is large, the oil
tank volume is small; the bearing is worn, and the transmission is
stifling.
5. Serious oil leakage of leaking oil pipe (internal and external
leakage): wear of cylinder block and port plate, plunger and plug hole; wear of
variable piston, resulting in leakage; damage of joint seal; oil leakage of oil
seal.
6. Pump can not rotate: plunger stuck; slide shoe off; ball head
broken; return disk broken; cylinder and port plate sintering;
7. Variable
mechanism failure: the arc surface of variable head bearing bush is seriously
worn; the control oil channel is blocked; the variable piston is stuck; the
control valve spring is damaged; the variable mechanism leaks
8. Wear or burn
out of mating surface between port plate and cylinder body: dirty oil; no oil in
the pump during startup; insufficient hardness of port plate; poor material of
cylinder body; high temperature and high pressure deformation of port plate;
poor coaxiality of bearing hole and transmission shaft in pump housing; too
large mating clearance between cylinder body and bearing; too small clearance
between drive shaft spline mating; the valve plate and rotation center are not
vertical; the transmission shaft is bent; matching The high and low pressure
transition area of the flow plate is seriously trapped in oil.
9. Wear or
burn out of joint surface of slipper and swashplate: oil pollution; plug of
damping hole of plunger or slipper; insufficient hardness or machining accuracy
of swashplate; inconsistent thickness of slipper shoulder; insufficient accuracy
of hydrostatic bearing on slipper surface; small plane of plunger ball head.
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