Hydraulic pump wears away badly case study

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  • source:MARSTEN CNC Machining
(1) check luffing jib oil cylinder inside leakage circumstance. The simplest method is rise luffing jib, see its whether apparent freedom drops. If fall to disassemble apparently,oil cylinder is checked, if sealing ring already wore away should grant to change. Rame2sub" > (2) the examination operates a powerful person. Clean relief valve above all, whether does core of examination a powerful person wear away, if wear away,should change. After relief valve is installed, be like still invariant, reexamination operates core of a powerful person of a powerful person wear out condition, unoccupied place use limit is meantime commonly 0. 06mm, wear away to should change badly. (3) the pressure that measures hydraulic pump. Be like pressure on the low side, undertake adjustment, force still is not moved go up, explain hydraulic pump wears away badly. The pressure that measures hydraulic pump via the examination is only 5 - 7MPa, decide pressure under the forehead of hydraulic pressure system apparently. Disassemble discover axle sleeve already wore away after hydraulic pump, wall of meiobar pump case by gear serious “ sweeps modular ” , sidewall also has a bit wear away. This shows, cause luffing jib belt to carry the main reason that cannot promote to be: A.

Hydraulic pump wears away badly. Inside the pump when low speed runs leak is serious; When high speed runs, pump pressure force has a bit rise, but as a result of pump wear away reach inside discharge, cubage efficiency drops significantly, very inaccessible rated pressure. Hydraulic pump works for long aggravate wear away, oily temperature rise is fast, cause hydraulic pressure component to wear away from this the ageing that reachs weather strip, attaint, lose sealed ability, hydraulic pressure oil is degenerative, bring about breakdown happening finally. B. Type selecting of hydraulic pressure component is unreasonable. Norms of luffing jib oil cylinder is 70 ／ 40 nonstandard series, standard component of weather strip Yi Weifei, production cost is high and weather strip changes disadvantageous. Cylinder diameter of luffing jib oil cylinder is small, certainly will makes systematic setting pressure high. C. Design of hydraulic pressure system is unreasonable. By the graph 1 knowable, operate a powerful person and steering gear of complete hydraulic pressure establish ties for odd pump, pressure of relief valve setting divides 16MPa, and the nominal working pressure of hydraulic pump also is 16MPa. Hydraulic pump often is in full load or long excess load (high pressure) the job below the circumstance, and the system has hydraulic impact, long-term not oil change, hydraulic pressure oil gets pollution, aggravate hydraulic pump wears away, blast of pump case of hydraulic pump of as a result is cracked (hind ever discovered this kind of fault) . 2 improve reach the result (L) improve design of hydraulic pressure system. The course is proved for many times, use advanced pressure-gradient control valve and bear to send form of steering gear of feeling complete hydraulic pressure finally. New system can according to turn to a requirement, preferential distribute flow to its, no matter discretion of rotate speed of laden size, steering wheel all can assure,offer oil enough, odd portion can provide entirely equipment loop is used, because turn to loop to offer oil,eliminated thereby overmuch and cause power loss, improved systematic efficiency, reduced the actuating pressure of hydraulic pump. (2) optimize oil cylinder of design luffing jib and hydraulic pump modelling, reduce systematic actuating pressure. Through optimizing computation, luffing jib oil cylinder uses series of standard 80 ／ 4. Volume of hydraulic pump platoon rises by 10ml/r for 14ml/r, systematic setting pressure is 14MPa, satisfied luffing jib oil cylinder to cite lift and speed demand. (3) use correctly what still should notice fork-lift truck in use process with safeguard, be added regularly or change hydraulic pressure is oily, the cleanness that carries hydraulic pressure oil is spent, strengthen be checked daily and safeguard. Via improving design of hydraulic pressure system, gear pump job is more smooth, appear no longer overload circumstance. Oil path design is reasonable at the same time, improve systematic efficiency, and sufficient play is overall performance characteristics, improved work efficiency. Turn to a movement flowing and reliable, “ changes direction to wave when avoiding high speed the phenomenon of ” . CNC Milling