


全文预览已结束
下载本文档
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
Crushing TestsWhen a new or unusual application is encountered, samples of the material may be crushed at Pennsylvania Crushers Test Laboratory to determine which crusher is most suitable.By crushing samples of the material, significant facts can be learned for predicting the performance of full capacity machines with acceptable accuracy. Laboratory tests can prove or disprove the relative merits of various types of crushers. They also provide an opportunity to evaluate the effects of various crusher settings, speeds, feeding methods, and height of drop. In the lab, one element at a time can be changed while all others are held constant. Under such conditions, any changes in crushing results can be isolated and evaluated by our application engineers. You can contact us online to inquire about scheduling a test.Testing ProcedureThe normal procedure is to test crush a representative sample of the material and to then determine the product size gradation. From this data, a graph is plotted showing the cumulative percentage of material passing each screen size. By comparing screen analyses and other criteria with those associated with familiar materials, an experienced crusher application engineer can estimate the overall crushing performance as well as power requirements. The engineer can also detect characteristics that require special design considerations or auxiliary equipment. Deciding FactorsTests may show that two or more types of crushers will perform equally well on a particular material. But other factors must still be considered such as headroom, desirability of fines, product shape, economics of maintenance and operations, and the adaptability of the crusher to future plant expansions.How To Take SamplesTo ensure meaningful results from the Pennsylvania Crusher Test Laboratory, it is important that a truly representative sample of material be provided. Care must be taken to ensure that the sample is collected from a true cross section of the material and that it is packed to retain its original characteristics (moisture, size, shape, etc.). Measuring Crushing ResistanceA basic premise in equipment selection is that the crusher be stronger than the material that it must crush. How strong are rocks and ore? While there is no direct measurement of “resistance to crushing”, it is possible to measure compressive strength and the elastic properties of a material. The graph below shows a typical plot of test results for different materials, and it demonstrates the relationship between compressive load and resulting displacement. The material exhibiting twice as much displacement under compression will normally require twice as much power to be crushed.Measuring Relative AbrasivenessIt is difficult to predict the abrasive action of rocks, minerals, and ores. Often, rocks belonging to the same geological classification will vary widely in abrasiveness from one locality to another. Therefore, in order to select the proper crusher, we must have some reliable measurement of the abrasiveness of the specific material. Abrasiveness can be determined either from prior experience or by testing in semi-production plants, but a simpler method has been developed by Pennsylvania Crusher Corporation. Penn Crushers test method is usually reliablein establishing relative abrasiveness by using four 400-gram samples of the material to be crushed. Each sample of material is rotated for 15 minutes in a drum with a steel paddle. After the four separate batches are run, the average milligrams of weight loss by the paddle is measured. This will serve as a relative index of abrasive action. The higher the index, the greater the abrasiveness.This test provides a practical index of abrasiveness. Such test data has been collected for many years on numerous samples of rocks and ores. Typical scales of relative abrasiveness derived from this testing procedure are shown in the table above. To see a complete Index of Abrasiveness, please download our Handbook of Crushing.(We ask you to register before downloading this valuable PDF document). To schedule a crushingtest, call 610-544-7200
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 2025年中国天然橡胶项目创业计划书
- 2025年土地复垦方案编制规程建设项目
- 2025年中国硼烷四氢呋喃溶液项目投资计划书
- 2025年中国纳米氧化铝项目投资计划书
- 2025年建设方案与规划方案的生态修复与环境恢复
- 2025年中国脱氢乙酸项目创业计划书
- 2025年低空经济无人机城市空中交通发展策略报告
- 2025年矿产资源勘探报告
- 树虎个人简介
- 中国三聚乙醛项目创业投资方案
- 药品不良反应和医疗器械不良事件监测培训终杨课件
- 海尔人单合一管理模式课件
- 新生儿肺炎诊疗规范
- 《孤独的小螃蟹》课件PPT
- 池塘养鱼高产新技术
- GB/T 31887.1-2019自行车照明和回复反射装置第1部分:照明和光信号装置
- 新人教版九年级物理实验报告册全
- GB/T 20913-2007乘用车正面偏置碰撞的乘员保护
- GB/T 10183.1-2010起重机车轮及大车和小车轨道公差第1部分:总则
- 三年级作文秋天的景色课件
- 临床技术操作规范,重症医学分册
评论
0/150
提交评论