共查询到20条相似文献，搜索用时 171 毫秒
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小径原木干燥工艺初探 总被引：2，自引：0，他引：2
本文是在桦木（Ｂｅｔｕｌａｐｌａｔｙｐｈｙｌｌａ）、刺槐（Ｒｏｂｉｎｉａｐｓｅｕｄｏａｃａｃｉａ）与水曲柳（Ｆｒａｘｉ－ｎｕｓｍａｎｄｓｈｕｒｉｃａ）等小径原木干燥可行性分析与干燥特性研究等工作的基础上，总结出了小径原木的干燥工艺过程。生产实践证明，该工艺过程对小径原木的干燥是可行的。 相似文献
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根据目前我国胶合板企业原木结构变化情况以及对小径木旋切或剩余木芯复旋的需要，对高转速小径木液压双卡轴旋切机进行了研究和开发，设计和试制出一种适合于小径木旋切的出板速度较高的液压双卡轴旋切机，以满足人造板厂对小径木旋切设备的需求。 相似文献
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随着天然大径级优质木材的日益减少，短周期人工林所占木材资源比重不断增加，来自人工林的小径级原木将成为我国主要木材资源之一。因此，挖掘现有小径级原木的资源潜力，搞好小径级原木的合理加工，提高锯材出材率和利用率，对提高企业经济效益，缓解资源危机，具有非常重要的现实意义。 相似文献
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我国中幼林比重大，南方林区的飞播林主伐、桉树材的利用以及南北方林区人工林的抚育和间伐、北方林区大量小径桦木的利用等．均需使用小径原木剥皮机。本文列举很多调查材料表明，BBP123Q小径原木剥皮机在我国有着广阔的使用前景。 相似文献
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以普通油茶作砧木和接穗进行大树嫁接换冠,研究不同嫁接条件对油茶接穗成活及生长的影响。结果表明:砧木年龄、嫁接时期、接穗保存时间对接穗成活有显著影响,断砧高度对接穗成活没有显著影响;砧木年龄、断砧高度、嫁接时期对接穗新梢长度有显著影响,接穗保存时间在接穗成活后对新梢长度没有显著影响。选择20 a砧木+25～50 cm断砧高度+6月上旬+采穗当天嫁接,最有利于提高油茶的嫁接成活率和新梢长度。 相似文献
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《Scandinavian Journal of Forest Research》2012,27(3):245-250
Abstract The use of stumps for energy production has grown rapidly in Finland and is also commencing in Sweden, the UK and a number of other countries. Practically all stumps are comminuted either at the plant or at terminals, whereas a major part of small-diameter trees and logging residues is chipped at roadside landing. Until now, crushing of stumps has been done with heavy, often stationary, crushers. In smaller plants, construction of a stationary crusher is not economically feasible. In addition, transportation of stumps calls for special trucks, while economical transport distances are short owing to the small payload. Recently, effective mobile crushers suitable for the comminution of stumps, that can also operate as mobile chippers for logging residue and small-diameter trees, have been introduced. They move from landing to landing with the crushed material transported to the end-user by trucks. In this study a discrete-event simulation model was programmed to find optimal set-ups for the supply chain of crushed material made from stumps at different road transport distances. The simulation model was based on the continuous supply of crushed material from landings to a district heating plant. Transportation distances varied from 20 to 120 km, while the number of trucks varied from one to four. It was found that already at 20 km the use of two chip trucks is competitive and after 40 km a third truck should be introduced into the system. Beyond 100 km four trucks would be needed. The results were compared with those obtained from a static spreadsheet model. The static model underestimated the waiting cost in the situation where the productivity of crushing and truck transport was almost balanced. 相似文献
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《Wood material science & engineering》2013,8(4):167-175
Abstract A cost efficient process is the goal of all production, and each manufacturing step affects the material utilization and cost efficiency. There is high diversity in the inherent features of wood, and manufacturing steps must be able to handle this. The overall objective was to study the potential and problems in manufacturing production processes in terms of material utilization efficiency. The production of finger jointed bed sides was chosen as a study case, where the chain of production units are the sawmill, finger joint plant and furniture plant. This article describes the impact of raw material and wood defects that could affect the total yield. A total of 177 logs of three types were tested: butt, intermediate and fresh knot logs. The test material quality was detected and measured through all steps in the manufacturing chain. The results show differences between log types in down-grade causes, reject volume and final yield. Also, the test material showed high levels of defective components with process-related defects, which suggested the need for technical improvement in the manufacturing process. The intermediate log group showed the overall best result. 相似文献
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张素梅 《林业机械与木工设备》2007,35(1):26-28
研究了竹麻将席送料切边钻孔一体机的结构及传动系统的组成和工作原理,运用机械学理论拟合了使竹片在一体机上顺利有序进行送料、切边和钻孔时传动系统协调运动的条件及参数. 相似文献