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1 概述

用作重量(liang)檢驗的(de)檢重秤需要設(she)定(ding)稱重產品的(de)目標(biao)重量(liang)值 (Target Weight) 、限位值 (Limit) , 從(cong)而得(de)到重量(liang)分區 (Weight Zone) , 以便按產品的(de)稱重值進(jin)行合格品、非(fei)合格品的(de)分選。

一般用(yong)作(zuo)重(zhong)(zhong)量(liang)(liang)(liang)檢(jian)(jian)驗的檢(jian)(jian)重(zhong)(zhong)秤(cheng)是按三重(zhong)(zhong)量(liang)(liang)(liang)分區(qu)或五(wu)重(zhong)(zhong)量(liang)(liang)(liang)分區(qu)進行設(she)定, 顧(gu)名思義, 三重(zhong)(zhong)量(liang)(liang)(liang)分區(qu)和五(wu)重(zhong)(zhong)量(liang)(liang)(liang)分區(qu)分別(bie)有三個(ge)重(zhong)(zhong)量(liang)(liang)(liang)分區(qu)和五(wu)個(ge)重(zhong)(zhong)量(liang)(liang)(liang)分區(qu)。

三重(zhong)(zhong)(zhong)量(liang)分區(qu)(qu)(qu)的檢重(zhong)(zhong)(zhong)秤(cheng)投運前需(xu)(xu)設定(ding)目標重(zhong)(zhong)(zhong)量(liang)值(zhi)、上(shang)(shang)限(xian)(xian)值(zhi)TO1和(he)下限(xian)(xian)值(zhi)TU1, 2個限(xian)(xian)位(wei)值(zhi)將檢重(zhong)(zhong)(zhong)秤(cheng)得到的所有(you)稱重(zhong)(zhong)(zhong)數(shu)據(ju)值(zhi)歸類(lei)成三個重(zhong)(zhong)(zhong)量(liang)分區(qu)(qu)(qu):欠重(zhong)(zhong)(zhong)區(qu)(qu)(qu)、合(he)格區(qu)(qu)(qu)、超重(zhong)(zhong)(zhong)區(qu)(qu)(qu)。低(di)于(yu)下限(xian)(xian)值(zhi)的欠重(zhong)(zhong)(zhong)區(qu)(qu)(qu)和(he)高(gao)于(yu)上(shang)(shang)限(xian)(xian)值(zhi)的超重(zhong)(zhong)(zhong)區(qu)(qu)(qu)產(chan)品均(jun)為(wei)不合(he)格產(chan)品, 通過(guo)檢重(zhong)(zhong)(zhong)秤(cheng)后(hou)都將被剔除(chu), 而在上(shang)(shang)限(xian)(xian)值(zhi)和(he)下限(xian)(xian)值(zhi)之間的合(he)格區(qu)(qu)(qu)產(chan)品為(wei)合(he)格產(chan)品。目標重(zhong)(zhong)(zhong)量(liang)值(zhi)及(ji)限(xian)(xian)位(wei)值(zhi)設定(ding)需(xu)(xu)要遵(zun)守(shou)的規(gui)則是:

0<TUI<目標重(zhong)量<TO1<;檢重(zhong)秤(cheng)最大量程如如圖(tu)圖(tu)11所所示(shi)示(shi)。。

圖1 三(san)重(zhong)量(liang)分區的檢重(zhong)秤 

圖2 五重量(liang)分區的檢重秤  

世界各國(guo)(guo)對允許短(duan)缺(que)量(liang)(liang)的(de)規(gui)定(ding)(ding)(ding)大致相同, 如(ru)歐(ou)盟的(de)TNE (Tolerable Negative Error) 允許短(duan)缺(que)量(liang)(liang)規(gui)定(ding)(ding)(ding)、加(jia)拿(na)(na)大政府的(de)LOE (Limits of Error) 允許誤差(cha)值(zhi)規(gui)定(ding)(ding)(ding)、中國(guo)(guo)的(de)允許短(duan)缺(que)量(liang)(liang)T、美(mei)國(guo)(guo)的(de)MAV (Maximum Allowable Variation) 最(zui)大允許偏差(cha)規(gui)定(ding)(ding)(ding)等等, 但在(zai)(zai)某(mou)些方面(mian)還(huan)是有差(cha)別的(de), 比如(ru)歐(ou)盟、加(jia)拿(na)(na)大的(de)規(gui)定(ding)(ding)(ding)中為(wei)五重(zhong)量(liang)(liang)分區, 在(zai)(zai)TU1限位(wei)值(zhi)與TU2限位(wei)值(zhi)之間屬(shu)欠重(zhong)產品(pin)(pin)如(ru)果(guo)不超(chao)過總量(liang)(liang)的(de)2.5%, 則仍可作為(wei)合格品(pin)(pin), 而美(mei)國(guo)(guo)沒(mei)有這項規(gui)定(ding)(ding)(ding), 只要產品(pin)(pin)重(zhong)量(liang)(liang)不大于TU1限位(wei)值(zhi), 均(jun)屬(shu)不合格品(pin)(pin)。正因為(wei)如(ru)此, 當按歐(ou)盟、加(jia)拿(na)(na)大的(de)規(gui)定(ding)(ding)(ding)進行(xing)商品(pin)(pin)檢(jian)重(zhong)時(shi), 應按五重(zhong)量(liang)(liang)分區進行(xing)設置(zhi), 而按美(mei)國(guo)(guo)規(gui)定(ding)(ding)(ding)執行(xing)時(shi), 則可由(you)用戶選擇(ze)三重(zhong)量(liang)(liang)分區或五重(zhong)量(liang)(liang)分區。

檢重秤的準確度越(yue)高, 包裝產品(pin)稱重值的分(fen)散(san)度越(yue)小, 限(xian)位值可越(yue)靠(kao)近目(mu)標重量值。

表1中的允許短缺量T對檢重秤的準確度提出了要求, 如果我們用標準偏差σ來代替準確度 (準確度=3σ) 

圖3 檢重秤運(yun)行畫面 

圖4 檢重秤運行畫面   下載原圖

5 結束語

用作重(zhong)(zhong)(zhong)量(liang)檢驗的(de)檢重(zhong)(zhong)(zhong)秤(cheng)在投運(yun)前要對(dui)設定值(zhi)進行設定, 這關系到檢重(zhong)(zhong)(zhong)秤(cheng)的(de)正常運(yun)行, 也關系到減少溢裝量(liang)、提高企業的(de)經(jing)濟效益(yi), 因此應該受(shou)到檢重(zhong)(zhong)(zhong)秤(cheng)運(yun)行維(wei)護(hu)人員(yuan)的(de)重(zhong)(zhong)(zhong)視。本(ben)文探討的(de)幾種檢重(zhong)(zhong)(zhong)秤(cheng)設定值(zhi)的(de)設定方式, 可供大(da)家(jia)參考。