小型力传感器在沙柳切削过程中的应用

目前用于沙生灌木切削的削片机普遍存在动力输出大而造成能源浪费的问题,为了确定切削力的大小,基于木材切削的普遍规律设计了用于测量切削力的小型传感器对切削过程进行监测,从而得出在不同切削状态下主切削力和法向切削力的值,为后续工作提供参考。     

Experimental study about the effects of disc chipper settings on the distribution of wood chip size

Nowadays wood should be of principal sources of biomass. This wood is transformed into chips in order to increase automatic operations and to decrease the technical effort needed at the energy conversion plant. Typical high quality chips, which are used to feed small woodchip boilers, vary in size from 10 × 10 × 5 mm to 15 × 15 × 8 mm. Chips that are relatively square and flat are easily conveyed, augured, and fed into the system smoothly. We are mainly interested in the raw material of inferior quality. A disc chipper test bench was constructed in our laboratory to study the chipping process in cutting conditions which are similar to those used in the industry. The test bench design allows many factors to be varied include cutting speed, feed per tooth, cutting angles, anvil height and cutting direction. In this paper, we attempt to understand the effect of several factors on chip size distribution. Four feeds per tooth, four cutting angles, two sharpness angles and three cutting speeds were chosen to cut wet logs of oak and fir wood, while the other factors remained constant. The results are similar for both oak and fir. The proportion of small chips decreases when we increase the feed per tooth, the cutting angle and the sharpness angle, whereas it increases when the cutting speed is increased. The feed per tooth and the cutting speed have a linear effect on the variations in the size distribution, while the cutting angle has a non-linear effect on these variations.     

数控盘式削片机的整体设计

针对国内外现有的木材削片机的特点,加工工人为因素比较多、工作效率低等设计背景。该文提出了一种数控盘式削片机的整体设计,主轴刀盘的设计和切削刀具的设计还有气动夹紧方法,整台机床的工作过程。该机床的特点是噪声低,加工出来的木片质量高,厚薄均匀。     

鼓式削片机设计基本问题的探讨

通过运动分析论述了鼓式削片机削片过程中遇角的变化对木片尺寸和几何形状的影响。根据对木片切料角的工艺要求可初步确定削片机的基本尺寸。通过受力分析论述了适宜鼓式削片机加工原料的形态，进料槽的合理安装位置和尺寸，以及尽可能采用强制进料的理论根据。本文还从理论上分析了飞刀在刀鼓上采用内装刀和外装刀的利弊。     

婉约中见真率，温柔中透刚强--论李清照婉约词中的疏朗气

李清照，其创作众多，诗词文赋均写得好。她在词方面造诣很高，其词委婉清新，感情真挚，被称为“易安体”。在她的创作中又蕴含着清新、爽朗之气，将女人的妩媚与豪放完美的融合在一起，并生动地展示了她的生命历程和情感历程，为中国古代词的发展开创了新的范本。她以女性特有的柔情写婉约词，温婉妩媚。又将婉约词中注入了豪放的气质，疏朗气十足。本文分析了她的婉约词并着重分析了婉约词中的疏朗气，并提及了造成这种疏朗气的原因。     

大型生物质发电削片设备研制

在介绍农林生物质发电现状的基础上,指出了国内生物质发电设备存在的问题,对大型生物质发电设备的削片机进行了设计,并对研制的大型削片设备进行了现场试验。结果表明,该设备功率大、效率高、加工能力强,还能够适应林区的无电条件。     

Wood chipping with conical helical blades – Theoretical deliberations and practical experiments concerning the adjustment of chip length with a set pitch of the blade

Chipping wood with helical chippers has the disadvantage that the geometry of the chipper's rotor determines the length of the chips. A variation in size through the use of different infeed speeds is not possible due to the self-feeding mechanism of their construction. Until now, a variation in chip length could only be achieved by exchanging the chipper's rotor with one having another pitch. Theoretical deliberations show, that a variation in chip length is possible using different infeed angles. In the present investigation, this hypothesis was tested using practical experiments. Standardised preformed test rods were chipped with a small scale helical chipper at seven different infeed angles. The experimentation was done using poplar wood with a moisture content of 10% and 60% (wet basis). The results showed that the length of chips produced by helical chippers with a set pitch could also be changed in practice using this method. As assumed the length of the produced chips are decreasing with increasing infeed angles. Furthermore, it could be observed that the use of poplar wood with a higher moisture content leads to larger chip length in average. In addition, the infeed angle was found to have a significant influence on chip quality. Moreover, the chips formed during these experiments using an infeed parallel to the rotor's axis showed an exceptionally high degree of fraying and a lack of clean division between individual wood chips which had not been seen in the chips produced by other helical chippers so far.     

提升机全程松绳保护装置

从目前矿井提升机松绳保护现状出发，研究了一种利用力电传感器、配以单片机系统．实现对提升机全程松绳故障的监测和保护装置、从而进一步提高提升系统的安全性。     

小型枝桠削片机飞刀结构改进设计

针对小型枝桠削片机匕刀结构存在的问题，对飞刀结构进行改进。并从原理上对改进设计进行了分析。     

木材备料方案的选择

介绍了近年来部分引进的木浆生产线的原木备料系统的流程和设备.