顆粒抗壓碎力測(cè)試機(jī),亦稱顆粒強(qiáng)度測(cè)定儀,是一種用于精確測(cè)定各類固體顆粒物料抗壓強(qiáng)度的專用檢測(cè)儀器。該設(shè)備通過模擬顆粒在靜態(tài)壓力下的力學(xué)行為,測(cè)量其破碎時(shí)所承受的最大力值,從而評(píng)估顆粒的機(jī)械強(qiáng)度、均勻性及耐用性。在工業(yè)生產(chǎn)與質(zhì)量控制中,尤其在制藥、化工、化肥及材料科學(xué)領(lǐng)域,該儀器對(duì)于監(jiān)控產(chǎn)品物理性能、優(yōu)化生產(chǎn)工藝、保障產(chǎn)品在包裝、運(yùn)輸及使用過程中的完整性具有至關(guān)重要的作用。其設(shè)計(jì)與測(cè)試方法嚴(yán)格遵循國家及行業(yè)相關(guān)標(biāo)準(zhǔn)。
概述
顆粒抗壓碎力測(cè)試機(jī),亦稱顆粒強(qiáng)度測(cè)定儀,是一種用于精確測(cè)定各類固體顆粒物料抗壓強(qiáng)度的專用檢測(cè)儀器。該設(shè)備通過模擬顆粒在靜態(tài)壓力下的力學(xué)行為,測(cè)量其破碎時(shí)所承受的最大力值,從而評(píng)估顆粒的機(jī)械強(qiáng)度、均勻性及耐用性。在工業(yè)生產(chǎn)與質(zhì)量控制中,尤其在制藥、化工、化肥及材料科學(xué)領(lǐng)域,該儀器對(duì)于監(jiān)控產(chǎn)品物理性能、優(yōu)化生產(chǎn)工藝、保障產(chǎn)品在包裝、運(yùn)輸及使用過程中的完整性具有至關(guān)重要的作用。其設(shè)計(jì)與測(cè)試方法嚴(yán)格遵循國家及行業(yè)相關(guān)標(biāo)準(zhǔn)。
適用樣品
該儀器主要適用于需要評(píng)估單顆??箟核閺?qiáng)度的各類固體顆粒樣品。其應(yīng)用范圍廣泛,主要包括:
制藥行業(yè)樣品:如固體口服制劑片劑(素片、包衣片)、硬膠囊劑、顆粒劑、微丸等,用于評(píng)估其強(qiáng)度以確保生產(chǎn)、包裝及運(yùn)輸過程中的完整性。
化肥與化工行業(yè)樣品:如硝酸磷肥顆粒、肥料級(jí)氯hua鉀、氯化銨、鈣鎂磷肥、復(fù)合肥料等化肥顆粒,以及化工催化劑、分子篩、樹脂顆粒等。
其他材料樣品:包括但不限于塑料粒子、陶瓷微珠、食品顆粒、飼料顆粒、催化劑、吸附劑等需要檢驗(yàn)抗壓強(qiáng)度的球形或規(guī)則形狀顆粒。
測(cè)試原理
該儀器的測(cè)試原理基于靜態(tài)軸向壓縮試驗(yàn)法。將單顆待測(cè)樣品精確放置于儀器的下壓板中心位置,上方的壓頭(加載頭)在驅(qū)動(dòng)系統(tǒng)的控制下,以恒定且可設(shè)定的速度垂直向下對(duì)樣品施加軸向壓力。在此過程中,儀器內(nèi)置的高精度力值傳感器持續(xù)、實(shí)時(shí)地監(jiān)測(cè)并記錄所施加的壓力。隨著壓力線性增加,顆粒逐漸發(fā)生彈性變形直至其內(nèi)部結(jié)構(gòu)應(yīng)力達(dá)到極限,隨后發(fā)生破碎。儀器數(shù)據(jù)采集系統(tǒng)會(huì)精確捕捉并鎖定樣品破碎瞬間的峰值力值,該值即為該單顆粒的抗壓碎力。通過對(duì)同一批次足量、隨機(jī)取樣的顆粒(通常為30-100顆)進(jìn)行重復(fù)測(cè)試,并對(duì)所有有效峰值力值進(jìn)行統(tǒng)計(jì)分析,即可計(jì)算出該批次樣品的平均抗壓碎力以及標(biāo)準(zhǔn)偏差等統(tǒng)計(jì)參數(shù)。
測(cè)試標(biāo)準(zhǔn)
顆??箟核榱y(cè)試機(jī)的測(cè)試方法符合多項(xiàng)國家、行業(yè)標(biāo)準(zhǔn)所規(guī)定的科學(xué)原理與程序,確保測(cè)試數(shù)據(jù)的可比性。其核心測(cè)試依據(jù)包括但不限于:
GB/T 10516-2012《硝酸磷肥顆粒平均抗壓碎力的測(cè)定》:該標(biāo)準(zhǔn)是化肥顆粒強(qiáng)度測(cè)定的基礎(chǔ)方法標(biāo)準(zhǔn)。
GB/T 44750-2024《顆粒 抗壓強(qiáng)度的測(cè)量》:作為最新發(fā)布的通用基礎(chǔ)標(biāo)準(zhǔn),為各類顆粒的抗壓強(qiáng)度測(cè)量提供了統(tǒng)一的方法框架。
HG/T 2782-2024《化工催化劑顆??箟核榱Φ臏y(cè)定》及HG/T 2783-2020《分子篩抗壓碎力試驗(yàn)方法》:針對(duì)化工催化劑和分子篩的專用行業(yè)標(biāo)準(zhǔn)。
儀器亦兼容GB/T 37918-2019、GB/T 2946-2018、GB/T 20412-2021等具體產(chǎn)品標(biāo)準(zhǔn)中對(duì)顆粒強(qiáng)度的檢測(cè)要求。
儀器特征
現(xiàn)代顆??箟核榱y(cè)試機(jī)通常具備以下技術(shù)特征:
控制系統(tǒng):采用微機(jī)或可編程邏輯控制器(PLC)作為控制核心,實(shí)現(xiàn)測(cè)試過程的自動(dòng)化與高精度程序控制。
力值測(cè)量系統(tǒng):配備高精度力傳感器和信號(hào)處理單元,測(cè)量范圍常見有0-100N、0-500N等,精度通常優(yōu)于±0.5%滿量程。
驅(qū)動(dòng)與傳動(dòng)系統(tǒng):采用精密步進(jìn)電機(jī)或伺服電機(jī)配合滾珠絲杠傳動(dòng),實(shí)現(xiàn)壓頭在1-500mm/min范圍內(nèi)無級(jí)調(diào)速的平穩(wěn)、勻速運(yùn)動(dòng)。
人機(jī)交互界面:配置彩色觸摸屏或顯示屏,用于實(shí)時(shí)顯示測(cè)試曲線、力值、位移等信息,并方便地設(shè)置測(cè)試參數(shù)。
數(shù)據(jù)管理功能:具備自動(dòng)峰值保持、數(shù)據(jù)存儲(chǔ)、統(tǒng)計(jì)計(jì)算(平均值、最大值、最小值、標(biāo)準(zhǔn)偏差等)功能,并常內(nèi)置微型打印機(jī)直接輸出測(cè)試報(bào)告。
安全與擴(kuò)展性:設(shè)計(jì)有過載保護(hù)、自動(dòng)回位功能。部分型號(hào)支持更換專用夾具,以適應(yīng)不同形狀尺寸樣品的測(cè)試需求。
使用方法
準(zhǔn)備:將儀器置于平穩(wěn)臺(tái)面,接通電源并開機(jī)預(yù)熱。確保測(cè)試壓頭及樣品臺(tái)清潔、無雜物。
參數(shù)設(shè)置:通過控制面板或觸摸屏,根據(jù)測(cè)試標(biāo)準(zhǔn)或樣品特性,設(shè)置試驗(yàn)速度、試驗(yàn)?zāi)J降葏?shù)。
置零與校準(zhǔn):在空載狀態(tài)下進(jìn)行力值“置零”操作。若進(jìn)行精密測(cè)試,需確認(rèn)儀器在有效校準(zhǔn)期內(nèi)。
放置樣品:將單顆待測(cè)樣品小心置于下壓板(樣品臺(tái))的中心位置。
開始測(cè)試:?jiǎn)?dòng)測(cè)試程序,壓頭按設(shè)定速度下降并對(duì)樣品施壓,直至樣品破碎。
記錄數(shù)據(jù):儀器自動(dòng)記錄并保存該次測(cè)試的峰值破碎力。清理碎屑。
重復(fù)測(cè)試:重復(fù)步驟4至6,直至完成預(yù)設(shè)數(shù)量的樣品測(cè)試。
結(jié)果分析:儀器自動(dòng)計(jì)算并顯示統(tǒng)計(jì)結(jié)果(如平均抗壓碎力、標(biāo)準(zhǔn)偏差等)??赏ㄟ^打印機(jī)輸出報(bào)告或?qū)С鲭娮訑?shù)據(jù)。
維護(hù)保養(yǎng)
日常清潔:每次測(cè)試后,使用軟布或吹球清理樣品臺(tái)和壓頭接觸面,防止碎屑或粉塵積聚。
機(jī)械部件保養(yǎng):定期檢查傳動(dòng)部件(如絲杠)的運(yùn)動(dòng)是否順暢。依據(jù)設(shè)備使用說明書建議的周期和潤滑劑類型,進(jìn)行適量潤滑。
電氣與環(huán)境:保持儀器干燥、清潔,避免灰塵、潮濕空氣或腐蝕性氣體進(jìn)入機(jī)箱。長期不使用時(shí),應(yīng)定期通電以維持電子元件狀態(tài)。
傳感器保護(hù):嚴(yán)禁對(duì)力傳感器施加超過其量程的沖擊力或持續(xù)壓力。不進(jìn)行測(cè)試時(shí),應(yīng)確保壓頭與樣品臺(tái)保持分離狀態(tài)。
校準(zhǔn)方法與周期
校準(zhǔn)方法:儀器的核心校準(zhǔn)是對(duì)其力值測(cè)量系統(tǒng)進(jìn)行計(jì)量。必須使用經(jīng)更高級(jí)別計(jì)量機(jī)構(gòu)檢定合格的標(biāo)準(zhǔn)測(cè)力儀(或標(biāo)準(zhǔn)砝碼)進(jìn)行。在校準(zhǔn)點(diǎn)上,對(duì)比儀器顯示值與標(biāo)準(zhǔn)測(cè)力儀的標(biāo)準(zhǔn)值,計(jì)算其示值誤差和重復(fù)性誤差。位移(速度)測(cè)量系統(tǒng)也需通過外部計(jì)時(shí)和尺具進(jìn)行驗(yàn)證。
校準(zhǔn)周期:建議常規(guī)校準(zhǔn)周期為12個(gè)月。但在以下情況下,應(yīng)考慮重新校準(zhǔn)或進(jìn)行期間核查:儀器經(jīng)過重大維修或搬運(yùn)后;對(duì)測(cè)量結(jié)果產(chǎn)生疑問時(shí);用于非常重要的仲裁性檢測(cè)或質(zhì)量控制決策之前。所有校準(zhǔn)工作應(yīng)由具備相應(yīng)資質(zhì)的計(jì)量部門或經(jīng)專業(yè)培訓(xùn)的人員執(zhí)行,并妥善保存校準(zhǔn)證書。
常見故障與排除方法
開機(jī)無響應(yīng)或屏幕無顯示:檢查電源線是否連接牢固,電源插座是否有電,儀器電源開關(guān)是否已打開。
力值顯示異常(如始終為零、顯示最大值或數(shù)值不穩(wěn)定):檢查力值傳感器連接線是否可靠;確認(rèn)測(cè)試前是否執(zhí)行了準(zhǔn)確的“置零”操作;傳感器可能因過載受損,需聯(lián)系制造商或?qū)I(yè)技術(shù)人員檢修。
壓頭無法移動(dòng)或移動(dòng)速度異常:檢查電機(jī)驅(qū)動(dòng)器連接是否正常;確認(rèn)傳動(dòng)機(jī)構(gòu)是否有機(jī)械卡滯現(xiàn)象;核查軟件中的速度參數(shù)設(shè)置是否正確。
測(cè)試結(jié)果重復(fù)性差:首先檢查樣品本身是否均勻;確認(rèn)每次放置樣品的位置和姿態(tài)是否一致;檢查儀器臺(tái)面是否穩(wěn)固、無外界振動(dòng)干擾;排查儀器是否已超出校準(zhǔn)有效期。
打印功能故障:檢查打印機(jī)電源或數(shù)據(jù)線連接;確認(rèn)打印紙是否安裝正確、是否已用盡;檢查儀器系統(tǒng)設(shè)置中打印功能是否已啟用。
對(duì)于無法通過上述方法排除的復(fù)雜故障,應(yīng)立即停止使用儀器,并聯(lián)系設(shè)備供應(yīng)商或?qū)I(yè)維修人員進(jìn)行檢修,切勿自行拆卸。
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