CN102998217B - Method for judging whether hydraulic oil of cylinder is replaced and engineering machinery - Google Patents
Method for judging whether hydraulic oil of cylinder is replaced and engineering machinery Download PDFInfo
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- CN102998217B CN102998217B CN201210441945.8A CN201210441945A CN102998217B CN 102998217 B CN102998217 B CN 102998217B CN 201210441945 A CN201210441945 A CN 201210441945A CN 102998217 B CN102998217 B CN 102998217B
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Abstract
The invention discloses a method for judging whether hydraulic oil of a cylinder is replaced and engineering machinery, belonging to the technical field of hydraulic cylinders. The method comprises the following steps of: measuring to obtain a cylinder volume efficiency of new hydraulic oil and obtaining a corresponding hydraulic oil kinematic viscosity; measuring to obtain a cylinder volume efficiency of hydraulic oil after being used for a period of time and obtaining a corresponding hydraulic oil kinematic viscosity; calculating to obtain a hydraulic oil kinematic viscosity change value of the used hydraulic oil relative to the new hydraulic oil; comparing the hydraulic oil kinematic viscosity change value with a preset hydraulic oil kinematic viscosity change limit value; and if the hydraulic oil kinematic viscosity change value exceeds the limit value, replacing the hydraulic oil. According to the method, through associating the cylinder volume efficiency with hydraulic oil viscosity change and setting the hydraulic oil viscosity change limit value, by adopting a method of judging whether the hydraulic viscosity change exceeds the limit value to obtain the condition for judging that whether the hydraulic oil is replaced, the state of the hydraulic oil can be immediately known, and the resources of the hydraulic oil are effectively utilized.
Description
Technical field
The present invention relates to hydraulic cylinder technical field, particularly a kind of for judging the method whether oil cylinder hydraulic oil is changed and engineering machinery.
Background technology
Mainly contain three kinds of methods at present to measure the volumetric efficiency of hydraulic cylinder, 1 measures oil cylinder volumetric efficiency at the oil inlet pipe of oil cylinder and flowline connection traffic meter; 2 platform experiment test pump valves obtain oil cylinder volumetric efficiency; 3 settling amounts measured in the certain hour of hydraulic cylinder judge the volumetric efficiency of oil cylinder.
But flowmeter method, bench test method exist method complexity, client is not easy to operate at the scene, and expensive problem; And sedimentation, the relative displacement between each oil cylinder oil cylinder under certain condition and piston cylinder can only be measured.Whether above three kinds of methods all can only obtain the volumetric efficiency of oil cylinder, and oil cylinder volumetric efficiency and hydraulic oil viscosity are not changed foundation and contact, can not reach need the degree changed to judge to hydraulic oil.
Summary of the invention
Measure oil cylinder volumetric efficiency and do not change foundation with hydraulic oil viscosity to solve current engineering machinery and contact, thus can not being used for the problem judging whether oil cylinder hydraulic oil can be changed, now providing a kind of for judging the method whether oil cylinder hydraulic oil is changed and engineering machinery.Concrete technical scheme is as follows:
For judging the method whether oil cylinder hydraulic oil is changed, comprise the following steps,
Measure oily volumetric efficiency when obtaining the new hydraulic oil of normal operating conditions and obtain corresponding hydraulic oil kinematic viscosity;
Oily volumetric efficiency after measurement obtains normal operating conditions use certain hour during hydraulic oil also obtains corresponding hydraulic oil kinematic viscosity;
Calculate the hydraulic oil kinematic viscosity change value of the hydraulic oil after use relative to new hydraulic oil;
Hydraulic oil kinematic viscosity change value is changed warning value with the hydraulic oil kinematic viscosity preset and ultimate value compares;
If hydraulic oil kinematic viscosity change value is beyond ultimate value, then change hydraulic oil.
Further, do not go beyond the limit of value if also comprise hydraulic oil kinematic viscosity change value beyond warning value, then need the step of hydraulic oil being carried out to oil droplet Spot Jest.
Further, if also comprise the result that described oil droplet Spot Jest draws hydraulic oil serious pollution, the step of hydraulic oil is changed.
Further, described fluid Spot Jest mainly judges according to the spread condition of insolubles in fluid, and wherein fluid insolubles comprises wear metal, carbon distribution, colloid and dust.
Further, described warning value is ± 10%, and described ultimate value is ± 15%.
Further, the fluid volumetric efficiency that obtains of described measurement and hydraulic oil kinematic viscosity are the mean value that repetitive measurement obtains.
Further, the measuring method of described volumetric efficiency is for calculate by oil cylinder settling amount or use traffic measurement measures or use platform experiment method to obtain.
A kind of engineering machinery, described engineering machinery has used the method whether oil cylinder hydraulic oil is changed that judges described in above-mentioned any one.
Compared with prior art, technique scheme provide for judging that the method whether changed of oil cylinder hydraulic oil has the following advantages: by oil cylinder volumetric efficiency and hydraulic oil viscosity change are connected, and the ultimate value of hydraulic oil viscosity change is set, adopt and judge whether hydraulic oil viscosity change goes beyond the limit of value to obtain the method judging whether to change hydraulic oil, hydraulic oil state can be understood in time, effectively utilize hydraulic oil resource.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 be the embodiment of the present invention provide for judging the method flow diagram whether changed of oil cylinder hydraulic oil.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
As shown in Figure 1, embodiments provide and a kind ofly to comprise the following steps for judging the method whether changed of oil cylinder hydraulic oil,
Measure oily volumetric efficiency when obtaining the new hydraulic oil of normal operating conditions and obtain corresponding hydraulic oil kinematic viscosity;
Oily volumetric efficiency after measurement obtains normal operating conditions use certain hour during hydraulic oil also obtains corresponding hydraulic oil kinematic viscosity;
Calculate the hydraulic oil kinematic viscosity change value of the hydraulic oil after use relative to new hydraulic oil;
Hydraulic oil kinematic viscosity change value is changed warning value with the hydraulic oil kinematic viscosity preset and ultimate value compares;
If hydraulic oil kinematic viscosity change value is beyond ultimate value, then change hydraulic oil.
Further, do not go beyond the limit of value if also comprise hydraulic oil kinematic viscosity change value beyond warning value, then need the step of hydraulic oil being carried out to oil droplet Spot Jest.
Further, if also comprise the result that described oil droplet Spot Jest draws hydraulic oil serious pollution, the step of hydraulic oil is changed.
Further, fluid Spot Jest mainly judges according to the spread condition of insolubles in fluid, and wherein fluid insolubles comprises wear metal, carbon distribution, colloid and dust.
Further, warning value is ± 10%, and ultimate value is ± 15%.
Further, measure the fluid volumetric efficiency that obtains and hydraulic oil kinematic viscosity and be the mean value that repetitive measurement obtains.
Further, the measuring method of volumetric efficiency is for calculate by oil cylinder settling amount or use traffic measurement measures or use platform experiment method to obtain.
For crawler-mounted excavator, before measurement hydraulic cylinder fluid, also need generating machine oil, liquid coolant, hydraulic oil whether to be all in identical oil level at every turn; Hydraulic pressure correction systematic parameter simultaneously, ensures consistance.Also need the state checking hydraulic pump, valve, motor and O-ring seal, guarantee in good condition.Meanwhile, preferably prepare enough mixed dirt floors or pave plane, in the scope guaranteeing test mechanical, the difference in height on ground is less than 10mm, makes data more accurate.After test starts, hang at the scraper bowl of excavator or load the soil weight of constant weight, the weight of material of simulation excavator, and each measurement keeps weight consistent; Wherein soil weight is dipper capacity and the product excavating soil density, and soil density is the ratio of soil actual weight and dipper capacity.In excavator heat engine or after work a period of time, the hydraulic oil of hydraulic system formally starts to measure after reaching the uniform temperature observed temperature of hydraulic oil (in the hydraulic reservoir) and pressure.
Experiment adopts oil cylinder settling amount to calculate the volumetric efficiency of hydraulic cylinder, and can certainly adopt the volumetric efficiency changing the method test oil cylinders such as digging force test or flowmeter, the embodiment of the present invention does not limit at this.
Experiment start after, movable arm cylinder of excavator is stretched entirely, dipper with bucket cylinder is full reduced, entirely stretch or one entirely stretch one full reduced, then close excavator start measurement, each experiment measuring all keeps trystate consistent.Under the prerequisite of conservation condition and state consistency, repeatedly measure the change distance of (such as 5 minutes) each cylinder piston rod in Fixed Time Interval, finally average, and be exactly this excavator about volumetric efficiency corresponding at this temperature and pressure by mean value with the ratio of the effective length (i.e. the physical length of filling liquid force feed) of oil cylinder, and measure simultaneously obtain synthermal under the kinematic viscosity value of hydraulic oil.Finally measure and obtain multi-group data, set up the relation table that the volumetric efficiency shown in following table and hydraulic oil kinematic viscosity change.
Table one
When client is when using machine, if obviously sensation machine excavation efficiency and digging force less after, regularly carry out dependence test, under the same conditions, test volume efficiency and the change of hydraulic oil kinematic viscosity, obtain table one.
And the warning value setting the change of hydraulic oil kinematic viscosity as being no more than ± 10%, the limit value of kinematic viscosity change for being no more than ± 15%.After the change of hydraulic oil kinematic viscosity arrives warning value, get hydraulic oil and carry out rain drop glaze experimental tests, according to the spread condition of insolubles (wear metal, carbon distribution, colloid, dust etc.), judge whether to need to change hydraulic oil, avoid hydraulic system to suffer damage.
The hydraulic oil kinematic viscosity change corresponding when oil cylinder volumetric efficiency exceed ± and 10% and do not exceed ± 15%, rain drop glaze experimental tests result shows hydraulic oil serious pollution, reaches the condition of changing oil, and needs to change hydraulic oil in time.Exceed when the hydraulic oil kinematic viscosity that oil cylinder volumetric efficiency is corresponding changes ± 15%, need to change hydraulic oil.
A kind of engineering machinery, this project machinery uses and described above judges the method whether oil cylinder hydraulic oil is changed.The other parts of engineering machinery with reference to prior art, can not repeat at you at this.
The embodiment of the present invention is disclosed for judging that the method whether oil cylinder hydraulic oil is changed and engineering machinery establish oil cylinder hydraulic oil volumetric efficiency and hydraulic oil viscosity variation relation, and combine with rain drop glaze experimental tests, can simply effectively for client provides support, and on-the-spotly can understand hydraulic oil state in time, shorten reaction time, and effectively utilize hydraulic oil resource.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1., for judging the method whether oil cylinder hydraulic oil is changed, it is characterized in that, comprise the following steps,
Measure oily volumetric efficiency when obtaining the new hydraulic oil of normal operating conditions and obtain corresponding hydraulic oil kinematic viscosity;
Oily volumetric efficiency after measurement obtains normal operating conditions use certain hour during hydraulic oil also obtains corresponding hydraulic oil kinematic viscosity;
Calculate the hydraulic oil kinematic viscosity change value of the hydraulic oil after use relative to new hydraulic oil;
Hydraulic oil kinematic viscosity change value is changed warning value with the hydraulic oil kinematic viscosity preset and ultimate value compares;
If hydraulic oil kinematic viscosity change value is beyond ultimate value, then change hydraulic oil.
2. according to claim 1 for judging the method whether oil cylinder hydraulic oil is changed, it is characterized in that, do not go beyond the limit of value if also comprise hydraulic oil kinematic viscosity change value beyond warning value, then need the step of hydraulic oil being carried out to oil droplet Spot Jest.
3. according to claim 2 for judging the method whether oil cylinder hydraulic oil is changed, it is characterized in that, if also comprise the result that described oil droplet Spot Jest draws hydraulic oil serious pollution, change the step of hydraulic oil.
4. according to claim 2 for judging the method whether oil cylinder hydraulic oil is changed, it is characterized in that, described oil droplet Spot Jest mainly judges according to the spread condition of insolubles in fluid, and wherein fluid insolubles comprises wear metal, carbon distribution, colloid and dust.
5. according to claim 1 for judging the method whether oil cylinder hydraulic oil is changed, it is characterized in that, the oily volumetric efficiency that described measurement obtains and hydraulic oil kinematic viscosity are the mean value that repetitive measurement obtains.
6. according to claim 1ly it is characterized in that for judging the method whether changed of oil cylinder hydraulic oil, the measuring method of described volumetric efficiency is for calculate by oil cylinder sedimentation value or use traffic measurement measures or use platform experiment method to obtain.
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| CN201210441945.8A CN102998217B (en) | 2012-11-08 | 2012-11-08 | Method for judging whether hydraulic oil of cylinder is replaced and engineering machinery |
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| CN201210441945.8A CN102998217B (en) | 2012-11-08 | 2012-11-08 | Method for judging whether hydraulic oil of cylinder is replaced and engineering machinery |
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| CN102998217B true CN102998217B (en) | 2015-05-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107288957B (en) * | 2017-07-04 | 2019-03-19 | 佛山科学技术学院 | A method of restoring ceramic brick press with hydraulic oil viscosity and viscosity index (VI) |
| CN108999842B (en) * | 2017-11-13 | 2019-12-27 | 乐清市华尊电气有限公司 | Device for changing hydraulic oil for hydraulic machinery |
| CN114768304B (en) * | 2022-05-17 | 2023-07-14 | 北京恒诺信达生物技术有限公司 | Kitchen residue percolate grease separation method and system |
| CN116148133B (en) * | 2023-04-25 | 2023-08-29 | 西安热工研究院有限公司 | Method and device for evaluating quality of oil product of power in-use oil |
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| JPH05332912A (en) * | 1992-06-02 | 1993-12-17 | Hitachi Constr Mach Co Ltd | Detecting apparatus of degree of degradation of working oil |
| JPH06117987A (en) * | 1992-10-07 | 1994-04-28 | Hitachi Constr Mach Co Ltd | Deterioration degree detector for hydraulic oil of hydraulic circuit |
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| US6580366B1 (en) * | 2000-10-13 | 2003-06-17 | Ford Global Technologies, Llc | System and method for evaluating automotive vehicle oil deterioration |
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