粉體強(qiáng)度測(cè)試儀(壓縮方程 可壓性)

FT-3500粉體壓縮強(qiáng)度測(cè)試儀

FT-3500 Powder compression strength tester

1.   原理和理論P(yáng)rinciple and theory：

顆粒在壓縮時(shí)要經(jīng)歷初步壓縮、顆粒重排、初始結(jié)構(gòu)形成、彈性形變、塑性形變、顆粒破碎、結(jié)合鍵形成、進(jìn)一步壓實(shí)及去除壓力后的彈性恢復(fù)等系列變化，顆粒結(jié)構(gòu)被破壞并發(fā)生重組形成新的結(jié)合鍵及壓縮體；通過(guò)對(duì)粉體施加屈服強(qiáng)度變形所需的主應(yīng)力，來(lái)分析粉體的體積、空隙率，壓縮度與屈服強(qiáng)度關(guān)系即（主應(yīng)力與粉體密度的變化關(guān)系），采用經(jīng)驗(yàn)方程法：Heckel、Kawakita、Adams方程及川北方程線性回歸方程的壓縮理論來(lái)分析粉體顆粒新品、研發(fā)固體產(chǎn)品比如在藥物處方及工藝選擇方面及壓實(shí)密度對(duì)壓力的要求等的預(yù)測(cè)性分析工具.

本機(jī)型還可以實(shí)現(xiàn)粉體電阻、電阻率、電導(dǎo)率的測(cè)量（導(dǎo)體粉末），可通過(guò)粉體壓縮與阻抗的變化關(guān)系或者粉末體壓縮過(guò)程中的靜電測(cè)量（絕緣粉體顆粒）.通過(guò)電性能的變化來(lái)判斷粉體壓縮特性.

 During compression , particle need undergo preliminary compression, particle rearrangement, the initial structure formation, elastic deformation, plastic deformation and grain crushing, combined with the key form, further compaction and of elasticity after removal the stress and so on series of change, such as granular structure destruction and restructuring to form a new bonding and compressed; By applying the principal stress to the deformation of the powder to analyze The volume change of the powder body and the pressure relation,(namely The relationship between primary stress and powder density), the relation between time and yield strength, yield strength and compression height change relations, using  the empirical equation method: Heckel, Kawakita, Adams equations and the compression theory of Kawakita’s Equation of linear regression equation  to analyze the new powder particles, research and development of solid products such as  predictive analysis tools in  drug prescription and process selection and Compaction density is required for pressure etc.

This model can realize measurement of  powder resistance, resistivity, conductivity( conductor powder),Judging   powder’s compression feature through the change of relationship between compression and impedance  or    powder body ‘s electrostatic measurement  In the process of powder compression.   (insulation powder particles).

二、目前比較認(rèn)可的壓縮成形機(jī)理At present, recognized mechanism of compression forming is：

認(rèn)為粒子受壓時(shí)，粒子間距離很近，從而在粒子間產(chǎn)生范德華力，靜電力等的引力；粒子受壓時(shí)，其塑性形變使粒子間的接觸面積增大；粒子受壓破碎時(shí)，產(chǎn)生的新生表面有較大表面自由能；粒子受壓變形時(shí)，粒子相互嵌合而產(chǎn)生的機(jī)械結(jié)合力；粒子受壓時(shí)，由于摩擦力而產(chǎn)生的熱，特別是顆粒間支撐點(diǎn)處局部溫度較高，使熔點(diǎn)較低的物料部分地熔融，解除壓力后重新固化而在粒子間形成 “固體橋”； 在水溶性粒子的接觸點(diǎn)處析出結(jié)晶而形成的 “固體橋”.

 The distance between the particles are very close when pressure apply on the particles, Thus create the van der Waals force, the electrostatic force and so on;When a particle is pressed, its plastic deformation increases the area of contact between particles.When the particle is crushed, the resulting surface has a greater surface free energy When the particles are compressed, the mechanical force of the particles is combined.Particles compression, heat generated by friction, especially  the local temperature of the interparticle support point between particles is higher, make the lower melting point material parts melt,  After relieve pressure ,curing in between particles to form the “solid bridge “;  At the contact point water-soluble particle precipitation crystallization and form of “solid bridge”

三、功能介紹Function introduction：

采用液壓恒壓加壓測(cè)量系統(tǒng)，7寸觸摸屏控制，高精度荷重單元控制系統(tǒng)能精確采集應(yīng)力變化數(shù)據(jù)，可以任意設(shè)置壓力、時(shí)間數(shù)據(jù)，位移數(shù)據(jù)由位移傳感器直讀，溫濕度數(shù)據(jù)通過(guò)傳感器獲得，多位數(shù)的AD芯片來(lái)保障數(shù)據(jù)的分析，全自動(dòng)模式，手動(dòng)操作模式并存；配置PC軟件可以獲得應(yīng)力與粉體密度關(guān)系；方程線性變化關(guān)系過(guò)程數(shù)據(jù)的分析和曲線圖譜，為生產(chǎn)企業(yè)和科研院所研發(fā)新品和改善工藝建立數(shù)據(jù)模型.

 Adopts hydraulic constant pressure pressing measurement system, 7 inch touch screen control, high precision load cell stress change control system can precisely collect data, the data can be arbitrarily set pressure, time, displacement direct reading data by displacement sensor, the temperature and humidity data obtained from the sensor, Multidigit AD chip to ensure multibit data analysis, automatic mode, manual mode and multistage set operating modes coexist;Configuring PC software to obtain the stress and powder density curve;The relationship between the time and the yield strength of the powder; Kawakita’s equation of linear regression equation of constant u, v relation and time flow function relation analysis of process data and curve graph, Establish data models for new products and processes developed by manufacturing enterprises and research institutes.

四、適用范圍Scope of Application：

食品、藥品、粉末冶金、陶瓷、制藥、化工、建筑等行業(yè)需要經(jīng)過(guò)壓縮或者壓鑄的粉末和顆粒物料；對(duì)粉末固體成形性及壓縮性在新品開(kāi)發(fā)，中試放大及生產(chǎn)過(guò)程中進(jìn)行分析研究，常用于粉體企業(yè)上下游產(chǎn)業(yè)，粉體科研院所和大中專院校，為粉體在強(qiáng)度性能，可壓縮性數(shù)據(jù).

Food, medicine, powder metallurgy, ceramics, pharmaceutical, chemical industry, construction and other industries which need to be compressed or die-cast powder and granular materials. Analysis and research on powder solid forming and compressibility in the development of new products, in pilot plant scale and production, often used in powder enterprise upstream and downstream industries, powder research institutes and colleges, provide reliable data on the strength, compressibility and liquidity of the powder.