【正文】 re the modern filtration counting abolished the former aperture measuring method to the filter characteristic evaluation and filters the material item of number law, but still continues to use in coal profession many enterprises and the user filters the material number law. This causes in the market the same 25μm filter operational accuracy difference to be very big. On the other hand, regarding the high accuracy filter (25μm), filters the material the choice and the processing is very strict, some enterprises cheat on labor and materials the choice to filter the material or the processing craft inferior do not go through a strategic pass, create the filter element processing flaw. Although filters the material choice to be appropriate because, but the processing craft is unqualified causes the filter end product precision to reduce obviously, cannot satisfy the system request. Therefore should formulate the battery solution control system to produce, the processing and examination profession standard especially important as soon as possible with the filter. ④ Entire filtration system not perfect or inadequate system, creates the system existence crack or the system function cannot display fully, serious influence battery solution control system performance display. Because does not have the filtration or the filter position is inappropriate, creates key protects the part not to obtain the protection, even if on the other hand had the filtration system, must plete the prevention, avoids the pollutant entering the system as far as possible, achieves cleanliness guarantee system which the driving prevention and the passive filtration protection unify, only then can guarantee the entire battery solution control system39。 ③可以解決特殊地質(zhì)條件和困難生產(chǎn)條件下的生產(chǎn)工藝問題，例如在薄煤層工作面人員無法在工作面內(nèi)操作的條件下，可以實現(xiàn)無人化工作面（需與刨煤機系統(tǒng)配合使用）。 目前面臨的問題、原因及解決途徑 隨著電液控制系統(tǒng)的推廣應用，也遇到了一些問題，制約著電液控制系統(tǒng)的使用和性能的充分發(fā)揮，具體表現(xiàn)在以下幾個方面： ①系統(tǒng)液壓元件故障率較全套引進系統(tǒng)相比偏高一些，特別是在工作面試生產(chǎn)和生產(chǎn)初期。m的精密過濾器，對介質(zhì)和乳化液配比提出了新的要求。假如 5μ m 顆粒上下游比值為 20，則可理解為 5μ m 過濾效率為 95%。這就造成市場上同樣 25μ m 的過濾器實際精度相差很大。必須從支架及其液壓附件生產(chǎn)、介質(zhì)清潔度控制和現(xiàn)場維護等幾個方面共同著手，才能充分展示電液控制系統(tǒng)的優(yōu)勢。 ④整個過濾系統(tǒng)不健全或不成體系，造成系統(tǒng)存在漏洞或系統(tǒng)功能不能充分發(fā)揮，嚴重影響電液控制系統(tǒng)性能發(fā)揮。如果發(fā)現(xiàn)最大顆粒為 20μ m，則過濾精度為 20μ m。凡采用 ISO16889 和試驗粉末為 ISOMTD 者，在標準過濾器的精度時用（ C）注明。這還是以有一個好的過濾系統(tǒng)為前提。 國內(nèi)外的應用情況 國外在 20 世紀 70 年代開始開發(fā)研制液壓支架用電控系統(tǒng)， 80 年代進入實質(zhì)性應用階段。提出了制定電液控制系統(tǒng)相關元部件生產(chǎn)制造統(tǒng)一標準、統(tǒng)一過濾元件行業(yè)標準及建立電液控制系統(tǒng)工作面主動預防與被動過濾防護相結合的清潔度控制體系的重要性，建立健全過濾防護體系，進一步發(fā)揮國產(chǎn)支架電液控制系統(tǒng)性能。s movements or cannot act, filter element big area jamming expiration. ③ Filters the system standard not to be unified, the part manufacture domestically filter element manufacture quality is unqualified, takes substandard products as fine products, causes the battery solution control system not to be unstable, failure rate higher. At present domestic is not unified to filter fineness39。s stability to be advantageous. ⑥ May control the support initially to support the strength well, obviously improves the supports and protections effect and the working surface management level. domestic and foreign application situation Overseas started in the 1970s to develop the development hydraulic support with the electrically controlled system, in the 80s