液壓設(shè)備和液壓油

1、液壓設(shè)備和液壓油液壓系統(tǒng)的優(yōu)越性動力強(qiáng)勁 無級控制安全可靠成本經(jīng)濟(jì)液壓系統(tǒng)主要行業(yè)的運(yùn)用鋼鐵行業(yè) 采礦工程建設(shè)塑膠行業(yè)機(jī)床工業(yè)液壓系統(tǒng)液壓系統(tǒng)基本組成部分油箱壓力源如：泵壓力閥、流量閥、方向閥和過濾器 驅(qū)動裝置如：液壓油缸或液壓馬達(dá)輸油管液壓液液壓系統(tǒng)液壓油的基本作用動力傳遞驅(qū)動系統(tǒng)工作系統(tǒng)保護(hù)潤滑、抗磨損、冷卻、密封以及防銹維持服務(wù)壽命在高溫及氧化狀態(tài)下保持穩(wěn)定，免受污染液壓系統(tǒng)系統(tǒng)要求 設(shè)備壽命和油壽命 系統(tǒng)無腐蝕 減少磨損 濾網(wǎng)無堵塞 精確電氣控制 抗氧性和熱穩(wěn)定性 分水能力 多金屬相容性 抗磨性能 過濾性油品質(zhì)量要求 液壓系統(tǒng)熱穩(wěn)定性 Cincinnati Milacron磨損Wear

2、: Vickers V104C熱裝備 Hot Rig低負(fù)荷Low-Load標(biāo)準(zhǔn)StandardFZG 故障階段耐久性Endurance : Vickers 35VQ25空氣釋放性能 Air Release: DIN51381抗泡沫性能Anti Foam: IP 146防銹蝕性能 Rusting: ASTM D665B抗乳化性能Demulsibility: ASTM D1401過濾性能Filterability: TMS 374粘滑運(yùn)動Stick Slip高溫抗氧化性能High Temperature Oxidation Resistance粘滑-運(yùn)動率Stick-Slip ratioTOST

3、壽命 TOST LifePassPassPass20001000Pass10mg310-25 mg3-510Pass50 mg15030-1503015015030-15030-15030 16mm has not increased. Therefore the 5mm filter effectively removes these.the number of particles 6 mm has increased from class 16 to 19. This might be considered surprising as a 5 mm filter is fitted. Ho

4、wever, remember the flushing procedure is continually removing particles from dirty surfaces into the oil. To improve the cleanliness class filtration must remove particles faster than they ingress into the oil, otherwise cleanliness will not improve.were this an operating system cycle rather than a

5、 flush more effective or additional filtration would be required to improve the cleanliness.Also note that a 5 micron filter does not remove 6 micron particles with great efficiency, this is typical of filter media.Remember - these readings are of oil cleanliness i.e. a measure of the particulates i

6、n the oil, therefore during flushing it is expected the oil will contain these particles and that by draining the hot flushing oil they will be removed from the system with the oil.Stage 2 Flushing with the test oil chargeThe system is now flushed with a charge of the oil to be tested.This flushing

7、cycle is intended to bring the system to an acceptable level of cleanliness for the testThe fluid from the barrel shows similar, but slightly worse, cleanliness 19/17/13 (8).Upon flushing through the rig, now fitted with a 1mm filter the cleanliness of the fluid improves to 16/13/9 (5). Particles in

8、 all three size ranges are being filtered out from the oil. Underlying the improvement is the removal of particulate contamination in the previous flush.The small filter 1 mm is a more effective barrier and will remove particles in 6 mm range which would have passed through the previous 5 mm filter.

9、At the end of the flushing cycle a cleanliness of 16/13/9 (5) has been achieved for the system, a reduction in particulate contamination in all three size ranges.Stage 3 Running the rigAnalogous to normal operation of a hydraulic systemThe test fluid from the barrel showed a cleanliness of 18/16/13

10、(8)remember the cleanliness of the system was 16/13/9 from the flushing employed so increased contamination of the system upon filling is inevitable.After 1 hour of testing the system cleanliness is 18/16/12 indicating flushing procedures were acceptable, infact cleanliness has improved.note the rig

11、 is again fitted with a five micron filter.After 250 hours of testing the particle count has increased to 20/18/14 (10). This is expected. Dirt may have ingressed into the system and/or solid contaminants may have been formed by the normal processes of oxidation and wear.In fact 80 mg of wear metals

12、 were generated in the test and this amount probably accounts for the increased particle count. the number of small particles has increased (4 micron range) considrable 18 - 20, typically in hydraulic systems it is the accumulation of large numbers of small particles that commonly cause system failu

13、res, the larger particles being easier to remove.Key PointsThe Cleanliness standards ISO 4406 and NAS 1638 are based on exponential scales, what may seem a small change in Class/Rating is a big improvement.The flushing oil acts as a transport media - it removes particles - therefore it will become c

14、ontaminated. To re-use flushing oil it needs to be filtered.Flushing is performed under low load conditions to avoid damaging moving parts whilst using a fluid which contains large amounts of particulate matter.The two stage flushing process used a larger 5 mm filter first followed by a 1 mm filter.

15、had the 1 mm filter been used during the first stage flush it may well have blocked or been unable to remove particulates at a fast enough rate.the second stage of flushing used a 1 mm filter. Although the rig is run on test with a 5 mm filter to clean the system a smaller filter is used.After flush

16、ing the fill of test oil added had a higher particulate count than the nominal value of the system.Filters are rated on size and efficiency, it is crucial to be able to remove particulate matter faster than it ingresses into the fluid. However filter sizes can be misleading. A 5 mm filter is unlikely to effectively remove 6 mm particles.During operational running the cleanliness of the system degrades. Additional filtration than the 5 mm filter would be required to restore cleanliness back to the init