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皮带秤的正确使用
双击自动滚屏 发布者:xzyl 发布时间:2010-3-1 阅读:768次 【字体:

皮带秤的正确使用

托辊式电子皮带秤的正确使用电子皮带秤是一种对散状物料作动态连续称重的计量设备。在建材行业,它广泛用于原燃料进厂和生产过程中的皮带输送环节。它也可与自动控制装置相结合,用于磨机等设备的自动配料和定量喂料系统。电子皮带秤应用准确度对企业原燃料的消耗、产品的质量以及经济效益等都有直接的影响。


  一、正确选型:用户在选择电子皮带秤时一般应考虑满足其准确度、称量范围、秤体型式、功能等要求。首先根据需要选择合乎要求的准确度。根据最新国家标准BC/T7721-95标准规定,按相对误差限把电子皮带秤分为0.25、0.5、1.0、2.0四个等级,相应的动态允许累计误差为0.125%、0.25%、0.5%、1.0%。根据建材行业的特点,从经济角度和维护便利的角度考虑,一般选择准确度为0.25%~0.5%的电子皮带秤比较合适。然后根据工艺所要求的输送量多少选择其流量和累计范围与之相适应的产品。根据现场条件选择合适的秤体(包括皮带宽度和皮带槽形角)。选择电子皮带秤,其基本功能应包括流量、本次、班、日、月、年累计量显示、自动标定量程、超载报警、停电保护等,其售后服务应完善,产品质量应有法定计量检验部门出具的检验结果报告。


  二、正确安装调试:电子皮带秤架安装及位置的选择,对其称量准确度影响很大。为了保证电子皮带秤的准确可靠,应做到以下几点:
  1.秤架和仪表的安装应特别注意选择适宜的环境条件,如周围振动小,相对湿度小,能防风雨侵蚀及日晒,特别应尽量远离强磁场和大热源,环境卫生较好。秤架距主动滚筒和落料点不得太近,要符合规定要求。
  2.固定电子皮带秤的输送机桁架,必须有足够的刚度,如果刚度不够,应加固。
  3.皮带运输机的倾角不宜太大,以避免物料在皮带上产生滚动造成较大的误差,一般倾角须小于20°。并且皮带有倾斜和水平段时,应尽量选在水平段安装秤架。
  4.为保证皮带与称量托辊的正常贴合,以使物料重量如实传到称量托辊上,称架应安装在输送皮带张力及其变化最小的位置上。皮带机应设张紧装置,尽量保证张力稳定,还应设防止跑偏装置,皮带跑偏不能超过10毫米。
  5.为保证皮带对称重托辊的压力变化最小,应精心调整称量段托辊,使托辊相互平行,并在一个平面上。
  6.对于槽形托辊组,必须使皮带与三根托辊均匀接触,皮带与底面托辊之间不能有间隙。
  7.为减少皮带张力的变化,皮带输送机应具有一个固定的落料点,且落料口处应装一个高度调整板,以使皮带上的物料均匀。或在计量段皮带的前方加一定量给定流量控制装置,使皮带机的流量均匀控制在满量程的80%~100%范围内。这样可以稳定工作点,提高皮带秤的准确度。


  三、定期进行实物标定:保证电子皮带秤系统动态测量准确度的关键之一是标定。标定的目的就是使仪表的累积显示值与实际值之间最大限度相吻合,其误差不能超过规定的指标。标定的方法有多种,如动态挂码法、砝码小车法、链码标定法和实物标定法。实践证明,标定误差最小、操作最容易的方法是实物标定,实物标定是一种对被输送的物料进行实际称重,使用校验装置来标定电子皮带秤的计量精度的方法。标定周期一般为1~2个月。在标定之前必须注意下列各种情况,以确保标定的精度。
  1.皮带是否有跑偏、断裂现象,托辊是否沾有物料,传感器是否有位移和被积料埋没等情况。
  2.仪表开关是否在正常位置上,仪表指示是否正常。
  3.电源电压是否过高或过低。
  4.如果上述情况均正常,计数器应跳字,而且速度正常。
  5.如果各开关位置正常而发生异状,则应停机进行故障检修。


  四、认真做好维护保养:要保证电子皮带秤的准确度稳定的必不可少的措施就是认真做好维护保养工作。在使用中要求做到以下几点:
  1.经常清除控制显示器的积尘,防止静电损坏元器件;及时清扫秤框,防止秤架受潮,灰尘、潮湿和锈蚀引起托辊磨擦力增加影响皮带张力,造成计量准确度发生变化。
  2.严防人体或过重物体压在称量段上,以防止传感器过载造成误差。装有测速传感器的,要防止测速磨擦轮打滑或沾灰加厚,以防止所测速度与实际物料速度不一致所带来的计量误差。
  3.皮带接头处不能用金属卡子,一定要胶接,平整、光滑。发现皮带有损坏或老化应及时修补和更换新的皮带。
  4.皮带输送机的输送量要低于电子皮带秤的额定量。
  5.操作管理人员应掌握电子皮带秤的标准和规范,建立和严格执行操作制度,及时分析和排除有关故障。

 
 

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徐州奕隆称重产业园简介

给煤机、皮带秤、电子皮带秤、输送机、给料机是徐州奕隆产业园主营产品,园区集设计、制造、销售于一体,科学设计,科学管理制造,以及先进的销售理念,为奕隆产业园打下良好的口碑与业绩,客户的支持就是奕隆前进的动力。给煤机主要技术参数包括:给煤机额定出力、给煤机中心距、进煤口、落煤口、带宽、主驱电动机型号/功率、清扫电动机型号/功率、给煤机计量精度、给煤机控制精度。电子皮带秤主要技术参数: 皮带秤系统精度:+/-0.25% 称量范围:1~8000t/h 皮带宽度:500~2400mm 皮带速度:0~4m/s 皮带输送机倾角:<6’(特殊物科《/=10’)。给料机技术参数 静态计量误差:≤0.5%; 给料机动态累计误差:≤1%; 控制准确度:优于1%; 仪表电源:单相220V±10%,50HZ; 拖动电源:三相380V±10%,50HZ; 给料机使用环境:温度:-10℃~+40℃湿度:5%~90% 。皮带采样装置分为二级采样和三级采样。二级采样装置常用于物料粒度和流量都较小的情况。三级采样装置通常用于物料粒度和流量都较大的情况。