机制棒的连续式固化成型工艺研究

Research on Continuous Solidification and Forming Processes of Machine-made Rod

对6、8、12mm3种孔径的筛网筛选和未筛选的木屑颗粒粒径进行了分析,颗粒粒径大多数在0.25～0.83mm之间,且分别占总量的81.42%、77.19%、73.67%和70.66%,含量依次降低。孔径越小,固化成型得率和灰分含量越低,而废料的比率越高。采用孔径12mm工业筛网时,成型机运转偶有堵料。结合生产实际,选用前半筛网8mm、后半筛网6mm筛选滚筒。同时,原料含水率对木屑固化成型的影响研究结果表明,原料含水率30%左右最佳,此含水率条件下,干燥炉膛的出口温度应控制在130～140℃。并进行了干燥、固化成型的中试试验,干燥成型得率85%,成型机可连续稳定工作140～280h,每小时机制棒平均产量266.1kg,平均制得机制棒270根,耗电量33.0kWh,燃料用量47.6kg,与目前国内的成型机相比,具有较大优势。

Particle size of wooden meal has been studied, which is bolted by industrial screen with 6 mm, 8 mm and 12 mm mesh size. It was found that most of particles were distributed in the interval between 25 and 83 grit number, and their contents are 81.42 %, 77.19 %, 73.67 % and 70.66 % respectively. The scrap ratio swelled with mesh size largening, while the ash content and the yield of solidification forming process both fell. The operation of forming machine would be affected using industrial screen with 12 mm mesh size. According to our records, we select the industrial screen that is made up of 2 parts, one half is 8 mm mesh size and the other is 6 mm mesh size. At the same time, the result showed that optimum moisture content was 30 %. At that moisture content, the outlet temperature of furnace chamber was controlled from 130 to 140 ℃. The industrial test showed ： yield of continuous solidification forming processes of machine-made rod was 85 % ; the steady operation time of forming machine was from 140 to 280 h ; the electric power consumption was 33.0 kWh/h ; the consumption of fuel was 47.6 kg/h.