Note a few kinds of of breakdown of system of model machine hydraulic pressure commonly used diagnostic methods
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source:GERHOLD CNC Machining
Spot of of a few kinds of of breakdown of system of hydraulic pressure of the machine that note model commonly used diagnostic methods notes model machine to note the diagnosis of breakdown of system of model machine hydraulic pressure, often accept the restriction of spot condition, and ask after occurrence breakdown eliminate as soon as possible, lest affect construction plan. The article introduces a few kinds of spots to note model machine to note breakdown of system of model machine hydraulic pressure to diagnose a method, offer reference. 1. Visual check law to a few relatively simple breakdown, can pass soon, fingerprint, ear listens and smell is heard wait for a method to undertake checking to component. For example, through the vision the examination can discover such as burst, leakage to oily, pine is taken off and be out of shape wait for breakdown imagination, can be maintained in time thereby or change fittings; With hand handholding vitta (especially glue is in charge of) , should pressure oil sheds outdated to be able to have oscillatory feeling, and the current that do not have oil passes or is this kind of phenomenon when pressure is too low. Additional, the hand is felt still can use at judgement to contain element of hydraulic pressure of ground of mechanical drive disk assembly lubricant case is good, feel with the hand ground of component case temperature changes, be like component housing overheat, explain lubricant and undesirable; Ear listens the breakdown place that can judge mechanical component attaint to cause and damage level, if hydraulic pump sucks the breakdown such as hairpin of open of a powerful person of empty, overflow, component,meet give out the concussion that is like water sound or " Shui Chuisheng " wait for unusual noise; Some components because the meeting is lubricant and overheat, undesirable wait for a reason with cavitation erosion and give out peculiar smell, through smell Wen Ke gives breakdown nod with judgement. 2. Trade diagnostic lacks diagnostic instrument in maintenance spot or be checked component is more accurate and unfavorable when ravelling, should use this method. Tear open component of ground of distrustful occurrence breakdown first below, change new or other machine go to work makes the normal, component that is the same as model have a test, see trouble whether eliminate to be able to make examine break. Check breakdown with trade diagnostic, although get,component of structure, spot is laid in or disassemble the limitation of the element such as inconvenience, the operation rises to compare a trouble possibly also, but the bulk of and so on of a powerful person, overflow a powerful person, one-way to be like a balance a powerful person tears open the component of outfit smally, easily, using this method still is more convenient. The function that because disassemble blindly,trade diagnostic can avoid and causes hydraulic pressure cell is reduced. Right breakdown if need not trade law examination, and tear open directly below doubtful advocate relief valve undertakes tearing open solving to its, if this component does not have a problem, possible meeting affects its performance after outfit answer. 3. Appearance measures examination law appearance to measure examination way is have the aid of the pressure of oil of hydraulic pressure of departmental to noting model machine to fix system of model machine hydraulic pressure cent, discharge and oil measure the breakdown that will judge this system lukewarmly to nod. Detect in general spot in, because note model machine to note the breakdown of system of model machine hydraulic pressure to often be behaved,be pressure inadequacy, check easily become aware; And of discharge it is more difficult to detect, the size of discharge can make a fault through carrying out the speed of component movement only slightly judgement. Accordingly, detect in the spot in, use the method of testing system pressure morely. 4. The fundamental that machine of principle organon project notes model machine to fix system of model machine hydraulic pressure is to use different hydraulic pressure cell, note loop of system of model machine hydraulic pressure to combination matchs and be become according to the machine that note model, can undertake analytic inference accordingly when occurrence breakdown phenomenon, preliminary judgement gives the place of breakdown and reason, suit the remedy to the case, give quickly eliminate alleged " constant power is variable " it is to show the output discharge of hydraulic pump and pressure can be self-adjusting, match with photograph of engine ground power, make engine can work to be nodded in optimal job normally thereby, develop the biggest efficiency. Accordingly, can think the power of engine is equal to calm value, the hair of output power N of engine is equal to hydraulic pump ground power input N is entered. N enters the P in type of of ＝ PQ/612 η -- the Q of output pressure of hydraulic pump -- the η of output discharge of hydraulic pump -- the work efficiency of hydraulic pump from formula knowable, the relation that the relation of P and Q is a hyperbola (see a picture 2 curves 1) , the structure that analyses hydraulic pump knows, the position that decides this relation curve and the power that of dot having shift is engine and crock of variable hydraulic pressure adjust the stiffness of bedspring. If bedspring stiffness produces change, the spot having shift that changed relation curve (see a picture 2 curves 2) ; Very apparent, right now N of N hair ＝ enters of ≥ PQ/612 η accordingly, when equipment works normally, namely when hydraulic pump outputs pressure to achieve rating, and output discharge was not moved to however match a cost, engine is in the working status of excess load. Via discovery of crock of disintegrate servo hydraulic pressure, bedspring already broke off, reason caused afore-mentioned trouble. Change after bedspring, it is normal that the job restored. To the spot the machine that note model notes the trouble of system of model machine hydraulic pressure, can note the working principle of system of model machine hydraulic pressure according to recording model machine, the order that executes component according to → of component of control of dynamical cell → is on systematic graph analysing breakdown reason to inference. If job of one grab luffing jib is faint, from the principle the analysis thinks, the job is commonly feebly drop as a result of oil pressure or discharge is reduced cause. Look from systematic graph, cause pressure to drop or the element has the likelihood that discharge reduces: It is gasoline tank, be short of oil purifier of oily, oil absorption to jam for instance, blowhole is not expedite; 2 it is the leakage inside hydraulic pump, if hydraulic pump force plunger cooperates clearance deputily to increase; 3 it is to operate on a powerful person advocate relief valve pressure has adjusted low or inside leakage is serious; 4 it is pressure of setting of a powerful person of overload of crock of luffing jib hydraulic pressure too low or inside leakage is serious; 5 it is an oil path not free. After considering these factors, again basis already some examinations exclude certain factor as a result, the limits of contractible breakdown, till find fault,the dot gives eliminate. The spot notes model machine to note breakdown of system of model machine hydraulic pressure to diagnose in, according to systematic work principle, want to master a few rules or common sense; It is an analysis breakdown in process is gradual change or mutation, if be gradual change, because wear away,be commonly bring about original measure is changed with what cooperate and lose primitive function; If be choppy, often be component unexpected damage be caused by, if bedspring breaks off, weather strip attaint, motion card dies or contamination jams etc. 2 be should be being distinguished is fragile still be not fragile, or it is the motion that is in high frequency burden to fall, perhaps be the hydraulic pressure component that malfunctions easily, the force plunger that is like hydraulic pump deputy, deserve to shed dish of deputy, variable servo and hydraulic pressure crock to wait. And be in carry low frequency, gently or basic and opposite dormant component, malfunction not easily, wait to malfunction not easily like reversal valve, sequence valve, pilot valve. After grasping these patterns, to judging breakdown quickly position can have positive effect. CNC Milling