外文翻譯--顎式破碎機在花崗巖采掘中受巖石強度性能的影響【中英文文獻譯文】

外文翻譯--顎式破碎機在花崗巖采掘中受巖石強度性能的影響【中英文文獻譯文】,中英文文獻譯文,外文,翻譯,顎式破碎機,花崗巖,采掘,巖石,強度,性能,機能,影響,中英文,文獻,譯文 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 Influence of some rock strength properties on jaw crusher performance in granite quarry Abstract：The influence of rock strength properties on Jaw Crusher performance was carried out to determine the effect of rock strength on crushing time and grain size distribution of the rocks．Investigation was conducted on four different rock samples namely marble．dolomite．1imestone and granite which were representatively selected from fragmented lumps in quarries．Unconfined compressive strength and Point load tests were carried out on each rock sample as well as crushing time and size analysis．The results of the strength parameters of each sample were correlated with the crushing time and the grain size distribution of the rock types。The results of the strength tests show that granite has the highest mean value of 101.67 MPa for Unconfined Compressive Strength(UCS)test．6.43 MPa for Point Load test while dolomite has the least mean value of 30.56 MPa for UCS test and 0.95MPa for Point Load test。According to the International Society for Rock Mechanic OSRM)standard．the granite rock sample maybe classified as having very high strength and dolomite rock sample，low strength．Also，the granite rock has the highest crushing time(2 1．O s)and dolomite rock has the least value(5．0 s)．Based on the results of the investigation，it was found out that there is a great influence of strength properties on crushing time of rock types． 1 Introduction The strength of a material refers to the materials ability to resist an applied force．Strength property of rock is the ability of the rock material to resist failure when load is applied without yielding or fracture．The mechanical properties of rock depend upon 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 the interaction between the crystals，particles and cementation material of which it is composed．The yield strength of a material is an adequate indicator of the material’s mechanical strength and is the parameter that predicts plastic deformation in the material．from which one can make informed decisions on how to increase the strength of a material depending on its micro-structural properties and the desired end effect．Strength is considered in terms of compressive strength，tensile strength，and shear strength，namely the limit states of compressive stress，tensile stress and shear stress， respectively．According to Reference，the effect of dynamic loading is probably the most important practical part of the strength of materials，especially the problem of fatigue．Repeated loading often initiates brittle cracks，which grow slowly until failure occurs．It is of paramount importance to first carryout size reduction of an ore or rock material on a laboratory scale for the ore or rock material to be profitably andeconomically processed industrially．This permits the determination of parameters such as liberation size，grindability，coarse to medium to fine proportion in any product of the crushing and grinding equipment and the proportion of values of gangues in the fines．Jaw Crusher is used for crushing rock material in mines and quarries。It provides the latest technology in heavy duty crusher design that delivers high production，infinite setting adjustment，larger feed opening bolted mainframe，cast swing，jaw holder and optional positioning of the crusher support feet to suit installation requirement．This crusher is designed for exceptional heavy and continuous application with heavy duty part for optimum operation and long life and this can be influenced by the strength properties of the rock．The influence of rock strength property can result to the loss of capacity to perform the stipulated function for which jaw crusher was designed． The UCS was the main quantitative method for characterizing the strength of rock materials．Point load test is used to determine rock strength indexes in geotechnical practice．Rock lithologies were classified into 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 general categories and conversion factors were determined for each category．This allows for intact rock strength data to be made available through point load testing for numerical geotechnical analysis and empirical rock mass classification systems such as the Coal Mine Roof Rating(CMRR)． Crushing is an integral portion for mineral processing operations and is critical for the preparation of ore for downstream process for mineral processing operations．Crushing of quarried rock is carried out in stages，with the primary crushing stage typically carried out using jaw crusher and subsequent(secondary and tertiary)．From field observation，the greater the number of crushing stage，the higher the amount of fine produced as a proportion of total plant throughout．The type of crusher used also directly controls the amount of fines produced． A recent study of quarry fines looked at possible relationship between quarry plant operation and the generation of quarry fines．The conclusion drawn have been critically revealed that hard rock aggregate plant production is directly proportional to the number of crushing stages；it increases with an increase in production stage．Low reduction fines generation at each stage especially where the rock or mineral are fragile，however，the cumulative fines production may be higher than a process using fewer stages with higher reduction． The panicle size analysis is the method used to determine the particle size distribution or the grain size distribution of rock／ ore materials．In practice，close size control of feed to mineral processing equipment is required in order to reduce the size effect and make the relative motion of the particles separation dependent．The particle size distribution of a matedal is important in understanding its physical and chemical propenies．It affects the strength and load bearing properties of rocks．The easiest conventional method of determining mineral particle size is sieve analysis，where grain size is separated on sieve of different sizes／ 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 apertures using Sieve Shaker．Thus the particle size distribution is defined in tems of discrete size ranges and measured in micron．It is usually determined over a list of size ranges that covers nearly all the sizes present in the sample． Some methods of determination allow much narrower size ranges to be defined that can be obtained by use of sieves and are applicable to panicle sizes outside the range available in sieves．However，the idea of notional‘sieve’that‘retains’particles above a certain size and‘passes’panicles below that size is universally used in presenting panicle size distribution data of all kinds．The size distribution may be expressed as a‘range’analysis，in which the amount in each size range is listed in order of fineness of particles．It may also be presented in‘cumulative form’in which the total of all sizes‘retained’or‘passed’by a single notional‘sieve’is given for a range of sizes．Range analysis is suitable when a particular ideal mid—range panicle size is being sought while cumulative analysis is used where the anlount of ‘under-size’ or‘over-size’must be controlled． 2 Materials and method The rock samples used for the investigation were obtained from different quarries in Nigeria．Dolomite，limestone and marble samples were collected from Edo State and granite rock samples from Ondo State。 Nigeria．Five boulders of each rock type of dimension 90 cm×50 cm×50 cm were representatively selected from recently blasted portion of the rocks which were ftee from natural defects，that is,discontinuities such as cracks，joints，fractures etc were packed properly to avoid damage during transportation．For the unconfined compressive strength test，the rock sample was cut into square shape with dimension of 60 mm×60 mm with masonry saw and Vernier caliper was used to measure the dimension．Also．for the point load test，the rock samples were broken into irregular shape 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 with sledge hammer．Vernier caliper was used to measure the diameter and length of irregular shaped rock samples from the different locations．The mean value for length ad diameter was detemined 。 The rock samples were prepared and tested in the laboratory to Intemational Society for Rock Mechanics Standard for each strength test carried out using Masonry Saw Machine and Compression Testing Machine and Point Load Tester respectively．The readings were taken and recorded．The size reduction of equal weighed of the rock samples was done using Laboratory Jaw crusher and the particle size distribution was carried out in notional set of sieves using Sieve Shaker．The crushing times were taken and recorded and the weights of samples retained on the sieves recorded for size distribution．The rock sample were cut into square shape by using masonry cutting machine，the cut samples were smooth，free of abrupt irregularities and strength．Five specimen of each of the rock samples were tested and the failure load was recorded for each test as the failure was observed axlally in the compressive testing machine． Some lumps of the different rock types were then crushed using the Laboratory Jaw crusher and taken record of the crushing times．The screening of the crushed rock samples was carried out in a set of sieve using the Laboratory Sieve Shaker．The sieve was arranged in the order of decreasing apenure：4700，2000，1700，11 80，850，600，425，and 212 by placing the sieve that has the largest opening at the top and the least opening at the bottom．A tight fitting pan or receiver was placed below the bottom sieve to receive the finest grained which is referred to as undersize．The crushed sample was placed on the top sieve and a lid was used to cover it to prevent escape of the rock sample during me process．The set of the sieve was then placed in a sieve shaker which vibrates the sieve for proper screening．This operation was carried out on each of the rock sample for five minutes．This was achieved by using the automatic control timer of the sieve shaker．After the screening analysis，the 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 retained sample on each sieve was measured on weigh balance and recorded to the cotresponding sieve opening size． 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 顎式破碎機在花崗巖采掘中受巖石強度性能的影響 摘要： 巖石強度性能的影響在顎式破碎機性能上取決于破碎的時間和巖石粒 度分配。調(diào)查被分為了四個不同的巖石樣品，既是從采 破碎的 的 性的大理石， 石，石 石，和 巖樣品。 樣品 了在 同的破碎時間和粒 分 的 強度和? ￠￡?￥。 ? 樣 品的§currency1'“ 和??的破碎時間和?fi巖石fl 的粒度分配??的–??·。 強度￠￡?￥ 巖是??的??101.67MP的 強度，6.43MP的 ”￠￡?￥，?… 石在 強度‰??了30.56，在”￠￡?￥的為 0.95MP。 ? `′?巖石機?強度ˉ?， 巖樣品被分fl為了 ˙?的強 度 石為¨ 的強度?！?， 巖 ???的破碎時間 21.??， 石 ?ˇ的破碎時間— 5.0??。 于?￥的 ?，? 巖石fl 的破碎時間§?˙ 強度性能的影響。 介紹 的強度– ? currency1的能currency1。巖石的強度性能是 ￠ ? a 時巖石 破?的能currency1。巖石的currency1學(xué)性?取決于?o 間 的 ，?是 ?粒和 ? ?。 的 a強度是 的機?強度的 ˉ'“ 是? ?性??的 ，從 從 微觀 構(gòu)特性和期望效 如何提? 的強度 智的決定。強度被認為分別是 強度， 拉 強度， 剪強度，即 應(yīng)currency1，拉應(yīng)currency1和剪應(yīng)currency1極 態(tài)計算。 '考，動態(tài) ￠效應(yīng) 能是 強度的?重要實踐 分，尤 是在疲勞問題上。重復(fù)￠￡常常 ?產(chǎn)生 縫， 增長緩慢直?發(fā)生故障。 ?為重要的就是在實￥室規(guī)模的礦石破碎使 工業(yè)加工的 利性和經(jīng)濟性。在任 何破碎和研磨設(shè)備產(chǎn)品 貴重細磨礦石就被 制例如釋放大小， 磨性'“ 定， 粗 細比例'“。顎式破碎機在礦山和采石 于破碎巖石 。?提供 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 了在重 破碎機設(shè)計的?新技術(shù)， 實現(xiàn)?產(chǎn)量、更大的進 口、分 大 機、回 轉(zhuǎn)度、 滿足安裝要求的顎式破碎機 架和 撐腳定位。 破碎機是為了 異常重￠連續(xù)運行 §巖石強度性能影響???佳效 操 和長壽命…設(shè)計的。 巖石強度性能的影響 能?導(dǎo)致顎式破碎機設(shè)計 規(guī)定功能的喪失。 強度 ?的主要特征就是巖石 強度的定量方法。”￠￡?￥ 于在巖土工程 實踐 確定巖石強度 “。巖石巖性分為?般fl和確定 個fl別的轉(zhuǎn)換因子。 使得完整的巖石強度的“ 將提供巖土工程“—分 與實證巖o分fl 統(tǒng)，例 如煤礦頂板”￡￠?￥。 粉碎是礦 加工工程的 ? 分，是為 步 礦工 行動 ?備的– 。破碎巖 石的 采是分 進行，與 粉碎進行 常使 顎式破碎機和 的 分 和 ?。從 觀 ，更大“量的粉碎 ，在整個生產(chǎn)?程 更? 的 細粉碎生產(chǎn)比例。 破碎機 直 的 制?生產(chǎn)?程 的 細破碎的 ?個? 的研 ?· 能–??礦山設(shè)備操 和礦 細生產(chǎn)。得 的 論 ， 細的 的巖石 生產(chǎn)的與巖石的破碎 “是? 比– 的，在生產(chǎn) ? …不 增長。 ˇ在生產(chǎn) ? ?程 粉 的比例，特別是在巖石 礦 是 碎的，?…，生產(chǎn)的 粉 能比?個使 ¨ˇ的 更 ?的 ?程。 在粒度分 ·確定粒子?￠分￡ 巖石?礦石 粒度分￡的方法，在實踐 ，礦 ￥ 加工設(shè)備，?要§currency1?￠ 制， ˇ規(guī)模效應(yīng)，使?粒的分 ' 運動，了“?的 理和?學(xué)性? 的粒度分￡是重要的。?影響了 巖石的強度和?￠性能，??fi的礦 ?粒的大小決定的常規(guī)方法是fl分 ,在 ?粒?￠大小不同的分 ? flfl–動fl使 。因 ，粒度分￡是定?在 ?? ￠· ??和微? 量。? 常是在?個確定的?￠· ?”?… 的‰ 的 大小樣品 。 定的? 方法? 的· 更`的大小·定?， ?′得和使 的fl? 于 的 ?￠· fl ? 。粒度分￡ 在?? ￠· ˉ‰在?粒細度? 為?個· 的分 。? 能 ?在于˙ ˉ‰¨在 ?￠ 定的· 被?個?? ?上的˙fl子¨? ‰的?￠ 定的 ˙??¨和˙ ?¨。極ˇ分 是?— 在?個特定的理 在 求粒 分 的方法，… 分 是 ·分 被 制的 于?￠和 ??￠的 分。 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論文 2.材料與方法 在 利 巖石樣品 ·調(diào)查研 從不同采石 ′得的樣品。 石，石 巖和大理石樣品 子 ， 巖 子 。 利 ， ?為90 ?×50 ?×50 ?的石 性從? 于fi?的a ??的 分。就是 ，如 不連續(xù) 縫，連 ，破碎?方 進行 ??裝， ?o在運 ?程 ?。 于 強度?￥，巖石樣品被currency1 機和 ˉ?? 量?￠·currency1?60 ? ×60 ?的方??！?， 于”￠￡ ?，巖石樣品 ?分?了不規(guī) 的? 。 ˉ??· 量直 從不同的 ”和不規(guī) ?的巖石樣品長度。長度??— 為直 量 定。 巖石樣品制備和巖石currency1學(xué)強度ˉ?的實￥室 ?， 個 ? `??進 行使?o 和 ?￥機，分別 進行”￠￡實￥。 采取的 “和記錄， 同?的巖石樣品 粉碎是利 實￥室破碎機和?粒大小分￡的搖動fl粉器· 模擬fl 的。粉碎時間被分別采取和記錄，樣品在fl子上粒度分￡的重量 被記 錄。巖石樣本被 石currency1割機currency1?了方?，currency1割樣品˙光滑，? 不規(guī) 的生 的 分。 巖石樣品進行了 ?， 個式樣在 被破?時 記錄為了 破?￡￠ 記錄，從 強度?￥機 觀 ?。 ? 不同巖石樣品的腫 被實￥室顎式破碎機破碎…?記錄 · 破碎的時間， 該破碎巖石樣品進行了fl fl￠使 實￥室fl–動fl。fl網(wǎng)被安ˉ在了遞 的： 4700，2000，1700，11 80，850，600，425，和212 ， ?將fl 在 頂 ?持?大的 度，在底 ?持?小的 度。?個緊§配—的的盤被放置在了fl 的底 ，為了 收好的?￠不足的?粒。在粉碎樣品放置于 ”的頂fl 是 ·掩”?，是在工 防止巖石樣本飛走。? 個fl子放置在?個搖動fl粉 器 ，利 震動 ?個? 的fl 。 個操 是在 個巖石樣品 為5分鐘。 是 ?使 該–動fl，fi動定時 制的。fl 分 ， 個??樣品 量o重 ?衡和記錄fl 。