上给式称重给煤机的系统构成和工作原理

The Composition and Principle of The Top-feeding Weighing Coal Feeder

目前,现有的称重给煤机的称重结构多采用单托辊或多托辊形式,其计量精度易受皮带张力、皮带刚度等影响,无法保证称重精度。现场称重给煤机受使用条件的限制,很难采用物料校准方式进行校准,一般均采用悬挂砝码校准、链码校准、电子校准等模拟方式进行校准,而这种模拟校准方式效果不理想,称重结果仍与实际称重存在较大误差。另外,称重给煤机在运行过程中机械特性的变化带来了皮带效应的影响,不能及时校准补偿,从而导致称重给煤机的计量精度低、长期稳定性不好。要想使称重给煤机的精度高、稳定性好,只有通过物料进行实物校准,并对不同流量下的系统计量线性误差进行修正,才能使称重给煤机达到较高的精度,为了不影响给煤机正常运行,实物校准必须实时在线完成。为了解决了称重给煤机多年来无法进行在线实物校准的难题,基于动静码物料校准技术的上给式称重给煤机应运而生。

At present,the existing weighing structure of the coal feeder adopts the form of single or multiple idlers,and its measuring accuracy is easily affected by belt tension,belt stiffness,etc.,which cannot guarantee the weighing accuracy.Due to the limitation of using conditions,it is difficult to use the material calibration method to calibrate the on-site weighing feeder.Generally,hanging weight calibration,chain code calibration,electronic calibration and other simulation methods are used for calibration.However,the simulation calibration method is not ideal,and there is still a large error between the weighing result and the actual weighing result.In addition,the change of mechanical characteristics of the weighing machine in the process of operation has brought about the impact of belt effect,which cannot be timely calibrated and compensated,resulting in low measurement accuracy and poor long-term stability of the weighing machine.In order to ensure high accuracy and good stability of the weighing coal feeder,only by material calibration and correction of linear error of system measurement under different flow rates can the weighing coal feeder achieve high accuracy.In order not to affect the normal operation of the coal feeder,the physical calibration must be completed in real time and online.In order to solve the problem that the weighing coal feeder can’t carry on the on-line physical calibration for many years,the top-feeding weighing coal feeder based on the material calibration technology of dynamic and static code arises at the right moment.