【正文】
and counts. The upstream some size pellet number pares the downstream same size pellet number, ratio isβ . β the value takes 5,20,75,200,2021 decides as enterprise evaluation filter level (this ratio is filter efficiency). If 5μm pellet upstream and downstream ratio is 20, then may understand that for 5μm the filter efficiency is 95%. Usually the labelling filter precision wrote =20, x for determined β=20 that particle size. ② Filter and so on automobile, machine shop truck, mon equipment lubrication, fuel oil mostly use the SAE806b standard. It uses the biggest pellet passage, the use glass micro bead or the AC experiment powder, joins the powder after the test platform from the filter downstream sample, the fluid type ( or ) filters and collects the pellet with the millipore filter, then examined under the microscope. If discovers the biggest pellet for 20μm, then filter fineness for 20μm. ③ The air cleaner, the purification environment use the filter, usually by weight filter efficiency nominal filtration characteristic. The custom said that several “9” the field test powder is ACFTD. Although above 3 kind of filter39。s promoted application, also has met some questions, is restricting the battery solution control system39。 Filtration system。s performance, demonstrates the support battery solution control system39。s life, simultaneously may protect working surface conveyer39。s performance requirement Take the cleanliness as the example, the domestic support in the production knew the battery solution controls when the support continues to use the original hand control system support production cleanliness control standard, this creates the support use problem, but because the battery solution control cross valve requests high to the cleanliness, entire support battery solution control system use initial period electromagism first pilot valve and main valve, because the pollution damage is serious, the failure rate increases. Generally requires period of time (12 months) after the use, the system can restore normally. This is take has a good filtration system as a premise. If filtration system in this process, because pollutes the serious jamming to expire, will create the hydraulic system vicious circle, the system failure rate further increases really, even creates the system paralysis. At present, urgent needs according to the battery solution control system request, the formulation battery solution control system Guanyuan part processing manufacture standard, thus guarantees the entire battery solution control system39。s superiority truly, only through improves the battery solution control system itself quality to be not enough. Must from the support and the hydraulic services production, the medium cleanliness control and onsite maintenance and so on several aspects begins together, can demonstrate the battery solution control system39。 ⑤易于實現帶壓移架,對于保護頂板的穩(wěn)定性和防止冒頂事故非常有利。以清潔度為例,國內支架在生產知道電液控支架時還是沿用原有手動控制系統(tǒng)支架生產清潔度控制標準,這就造成支架使用問題,但由于電液控制換向閥對清潔度要求高,整個支架電液控制系統(tǒng)使用初期電磁先導閥和主閥由于污染損壞嚴重,故 障率增加。 ③過濾系統(tǒng)標準不統(tǒng)一,部分國產化濾芯制造質量不合格,以次充好,造成電液控制系統(tǒng)不穩(wěn)定,故障率高等。 ②汽車、工程 車、一般設備潤滑、燃油等過濾器大多用 SAE806b 標準。雖然濾材選擇合適但由于加工工藝不合格造成過濾器成品精度明顯降低,不能滿足系統(tǒng)要