预涂过滤机的工作原理

YT 型转鼓过滤机工作原理与一般真空转鼓过滤机基本相同。主要区别在于YT 型过滤机在过滤前进行助滤剂（如硅藻土、珍珠岩等）的预涂。过滤时，槽内的助滤剂在真空抽吸作用下，在转鼓外表面形成所需厚度的预涂层，然后注入待过滤的浆料，在真空抽吸作用下分离的滤液透过预涂层和滤布，经吸液管，集液管，自动排放滤液缸（或汽液分离器）排出，而浆料中的固体颗粒被预涂层截留，由自动控制进给的机械刮刀连同硅藻土表层不断刮去。当预涂层残留厚度约为15mm 时，需重新进行预涂，进行下一个工作循环。

The working principle of YT precoat filter is same as that of vacuum drum filter. Main difference is that the YT precoat filter use filter aid (such as diatomite, perlite, etc.) as precoating before filtering. 

When filtering, under the effect of vacuum suction, aid in filter chest form coating on surface of drum with required thickness. Inject pulp needed filtration and then under the vacuum sution the filtrate go through precoating and filter cloth, through the pipettes, liquid collecting pipe, automatic discharge from filtrate tank (or vapor liquid separator), and the solid particles blocked precoating intercept and scraped with diatomite coat by automatic feeding mechanical scraper.