在使用三輥研磨機(jī)的時(shí)候，往往會(huì)出現(xiàn)這樣或那樣的問(wèn)題，機(jī)器本身也會(huì)有一些問(wèn)題出現(xiàn)，所以在使用的時(shí)候我們往往有很多地方需要注意，下面就來(lái)簡(jiǎn)單的說(shuō)一下需要注意的地方。
當(dāng)遇到流開(kāi)型而且是向著開(kāi)方向流時(shí)，這樣的情況下汽蝕、沖蝕就會(huì)主要作用在密封面上，使閥芯根部和閥芯閥座密封面很快就遭受破壞，這時(shí)流閉型就會(huì)向著閉方向流，然而汽蝕、沖蝕作用使得節(jié)流之后的閥座密封面以下會(huì)受到保護(hù)密封面和閥芯根部，從而能夠延長(zhǎng)壽命。作為流開(kāi)型使用的閥門(mén)，當(dāng)能夠進(jìn)行延長(zhǎng)壽命的問(wèn)題較為突出時(shí)，那么只需要改變流向就可以延長(zhǎng)它的壽命。
如果需要增長(zhǎng)節(jié)流通道，那么簡(jiǎn)單的方法就是加厚閥座，使閥座孔增長(zhǎng)，這樣就形成更長(zhǎng)的節(jié)流通道。這樣小小的改進(jìn)卻又很大的用處，一方面可以使流閉型節(jié)流后的突然擴(kuò)大，能夠?qū)C(jī)器中容易出現(xiàn)問(wèn)題的部位轉(zhuǎn)移破壞位置，使之遠(yuǎn)離密封面的作用；而且從另一方面來(lái)說(shuō)，又增加了節(jié)流阻力，減小了壓力的恢復(fù)程度，使汽蝕減弱。有的把閥座孔內(nèi)設(shè)計(jì)成臺(tái)階式、波浪式，就是為了增加阻力，削弱汽蝕。這種方法在引進(jìn)裝置中的高壓閥上和將老的閥加以改進(jìn)時(shí)經(jīng)常使用，也十分有效。
有些時(shí)候?yàn)榱丝蛊g(破壞形狀如蜂窩狀小點(diǎn))和抗沖刷(流線型的小溝)，則需要進(jìn)行改用耐汽蝕和沖刷的特殊材料來(lái)制造節(jié)流件。這種特殊材料有司太鋼、硬質(zhì)合金等，如果是為了抗腐蝕，可改用更耐腐蝕，并有一定機(jī)械性能、物理性能的材料。這種材料分為非金屬材料和金屬材料兩類(lèi)。
三輥研磨機(jī)的使用注意事項(xiàng)還有很多，以上所例舉的不過(guò)是其中的幾項(xiàng)而已，如果想要進(jìn)一步了解其它的注意事項(xiàng)快實(shí)際的辦法就是親自進(jìn)行操作，在實(shí)踐中總結(jié)經(jīng)驗(yàn)，為自己的使用打下良好的基礎(chǔ)。
中譯英：
In the use of three roller grinding machine when, often can appear such or in that way, the machine itself also has some problems, so when in use, we tend to have so many places that need attention, here is simple talk about places that need attention.
When the flow type and is open toward the opening direction of flow, cavitation, erosion of such cases will be a major role in the sealing surface, so that the roots spool and spool valve seat sealing surface soon destroyed, then the flow closed will toward the close direction flow cavitation, erosion, however the throttle after the seat sealing face the following protected seal surface and a spool root, so as to prolong the life of. As the flow opening type using the valve, when can the issue of prolonging life is more prominent, so only need to change the flow can prolong its life.
If you need to increase the throttle channel, so the simplest way is to thicken the seat, so that the valve seat hole growth, thus forming a longer throttle channel. Such a small improvement is very useful, on one hand can make the flow of closed type throttle after the sudden expansion, can machine the problems in site of metastatic failure location, away from the sealing surface of the role; and on the other hand, increase of cutting resistance, reducing pressure recovery, so that reduced cavitation. Some of the valve seat hole is designed into a stepped, wavy, is to increase the resistance, weaken cavitation. This method introduced in the device in the high pressure valve and the old valve to be improved when used regularly, but also very effective.
Sometimes in order to cavitation(failure shapes such as honeycomb dots)and erosion(streamlined groove), you will need to be converted to resistance to cavitation and erosion of the special material to manufacture a throttling element. This special material department Taigang, the hard alloy and so on, if it is to resist corrosion, can use more resistant to corrosion, and some mechanical properties, physical properties of materials. This material is divided into non-metallic materials and metal materials two.
Three roller grinding machine using notes there are many, the above example is but one of several only, if you want to further the understanding of other matters to the attention of the fastest and most practical approach is to operate, in practice summary experience, for its own use to lay a good foundation.
(圖/文http://m.zdrav.cn/)
加入收藏
