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选择好贮木场的卸车机械是提高木材生产率的重要问题之一。文章通过对鹤北林业局贮木场使用过的三种卸车机械(木架杆兜卸机;木架杆固定缆索起重机;龙门吊起重机)的主要性能指标、优缺点、经济分析(年投资额及年消耗费用)对比分析可知,龙门吊起重机是贮木场卸车作业的理想设备。虽然龙门吊一次性投资较大,但它所创造的效益是显著的,它具有目前国内贮木场卸车作业机械的全部优点,为上、下道工序的衔接带来了极有利的方便条件,还可为合理选材,提高经济材比重提供保障。 相似文献
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宫朝忠 《林业机械与木工设备》1982,(5)
我国东北林业企业的生产方式在六十年代以前,基本上是人力手工业季节性生产,而贮木场仅是一个转运站。1964年开始,伐区生产的原条直接运到贮木场,因此贮木场逐渐地有了卸车、造材、选材、归楞和装车等工序,从转运站变成了用机械装备起来的大型工场。合理地确定贮木场生产工艺流程和选择各工序的机械设 相似文献
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宋景禄 《林业机械与木工设备》1985,(4)
即将投产的BY5型液压起重臂,主要作为原木的装卸机具,完成山场和贮木场的归装作业。也可以作为固定的装卸机械,进行森铁车辆、大铁车辆、船舶的装卸作业,以及出河、贮木场归楞和选材台供 相似文献
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采用半悬臂式龙门吊协助选材传送机选材是贮木场提高选材能力的新途径.这对于坑木比重逐年增加的趋势,尤其具有推广价值.用这种方式选材,还可以使贮木场有效面积得到充分利用. 相似文献
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关于索式输送机和可拆链式输送机(022450)内蒙古阿里河林业局贮木场赵竹(150086)哈尔滨林机所马玲(150040)东北林业大学张学明输送机是贮木场内选材作业中的一种主要机械,按其本身的结构特点,可分成带有牵引构件的和无牵引构件的两种.而带有牵... 相似文献
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翟笃华 《林业机械与木工设备》1984,(6)
在我国贮木场的选材作业中,纵向输送机已广泛应用.据不完全统计,全国320个贮木场已有纵向输送机223条.它具有选材效率高、生产连续、易实现自动化等优点.但是,一些贮木场由于生产组织和工艺不尽合理,以及输送机技术参数选择不 相似文献
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郭鹰 《林业机械与木工设备》1996,(5):11-13
索式选材输送机驱动轮的选型与定型(165015)大兴安岭壮志林场郭鹰1索式输送机在选材作业中的位置在贮木场生产中,选材作业线是贯穿全场的生产线,且须与相关工序的机电设备能力匹配,否则将造成生产不均衡,产生工序间的堵塞现象。所以,选材线称为贮木场生产的... 相似文献
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可拆链式输送机在选材作业中的应用(150001)哈尔滨酿酒厂金宏达(150324)黑龙江省平山林业制药厂安允龙收稿日期:1997-04-031输送机应用概述选材作业是贮木场各道生产工序中的动脉。一定的选材形式,基本上决定了贮木场木材生产的作业方式和楞... 相似文献
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内蒙古大兴安岭林区,现有38个贮木场和装车点,每年到场商品材、抚育伐材和支拨调运木材约5百万立方米。这些贮木场多数建于五十年代和六十年代初期。建设初期,贮木场的设计是以常年流水作业为基本条件安排生产线、选材台、卸归装设备和原木堆放楞区的。贮木场投产后,为了适应冬季到材比重大、木材数量多的实际情况,打乱了原来的工艺布局,到处增设选材台和卸车设备,结果是工艺流程比较混乱。给以后的贮木场扩建、改造 相似文献
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基于功能分析系统技术的低碳建筑方案优化 总被引:1,自引:0,他引:1
指出了低碳建筑是建筑业发展的重要方向之一,方案优选又是低碳建筑前期策划的主要工作,因此以低碳建筑方案优选为研究对象,将低污染、低排放、低能耗及室内环境污染作为低碳建筑四大性能指标,以低碳建筑项目的功能性分析为基础,绘制了功能分析系统(FAST )图,进行了功能成本分析及功能性能分析;并运用最简单方案法,结合功能成本的矩阵算法,计算出功能成本数值分配额以及功能性能分配额,最后通过性能敏感性矩阵,利用相关的数值分析,得出了对高成本低性能贡献的功能应该采取替换或摒弃措施以及对性能有卓越贡献的功能需要着重考虑的结论,从而实现了方案的优化。 相似文献
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Dong Yuku Zhao Chunrui Northeast Forestry University 《林业研究》1991,2(1):83-90
In this paper,the physical and mechanical properties of important Chinese woodswere studied by using the methods of variable analysis, regression analysis,correlation analysis,principle component analysis and so on systematically.The results showed synthetical characteristicof the physical and mechanical properties of Chinese woods.Some opinions of former authors wererevised and some new laws were discovered.That is helpful to study of the physical and mechanicalproperties of woods. 相似文献
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Pian Rui-qi Zhao Yang Li Wei Chen Xiao-yang 《中国林学(英文版)》2007,9(4):272-278
Lespedeza bicolor Turcz is a native shrub in the temperate region of China. Thirteen provenances of L. bicolor were inves-tigated in our study. Morphological diversity among and within provenances were analyzed based on 19 phenotypic traits, including seven vegetative growth characteristics, nine floral traits and three pod characteristics. The coefficient of variation (CV) ranged from 6.4% to 65.4% and the phenotypic differentiation coefficient from 43.3% to 97.3%. Analyses of variance showed that there were extremely significant variations among and within provenances in pod length. Differences in plant height, inter-nodal length, number of branches, leaf width, leaf length and leaf area were not remarkable among provenance, but distinct within provenances. Other traits showed evidence of contrasts. Variation among provenances was the main part of phenotypic variation. Correlation analysis indicated that there were highly significant positive correlations between plant height and other vegetative growth characteristics. Floral traits were not associated with vegetative growth characteristics. The 13 provenances of L. bicolor investigated can be classi-fied into three groups according to a UPGMA cluster analysis. 相似文献
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The gloss of wood is a unique texture compared to that of other materials. To express it quantitatively, two digital-image analyses were performed. One method was multiresolutional contrast analysis, which was the new method developed in this study. The other method was fractal image analysis. Twenty-four specimens, including solid woods, wood-plastic composites (WPCs), printed grains, and granites, were prepared. Digital images of specimens were obtained in five sizes and in two illuminant directions (perpendicular and parallel to the grain). The multiresolutional contrast values of perpendicular illuminated images were calculated and compared among specimens. The result of this quantitative analysis was that the gloss of wood was characterized by bright spots in a relatively small area. Using fractal analysis, the fractal dimension of a digital image was used as an index of brightness changes, not for expressing the self-similarity. These indices showed results similar to those of the multiresolutional contrast analysis.Part of this paper was presented at the 47th annual meeting of the Japan Wood Research Society in Kochi, April 1997 相似文献
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随着我国工程管理体制的改革 ,工程监理制已在林业生态工程建设中逐步推行实施 ,林业生态工程监理具有地域性、时序性、灵活性、不可逆性、可补救性、直观性和长期性等特点 ,提出了林业生态工程监理须注意的一些问题 ,以控制林业生态工程的投资、质量和工期 ,取得林业生态工程建设的最大投资效益 相似文献
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对宽叶返魂草体细胞染色体计数,并对其核型进行分析,结果表明:宽叶返魂草的染色体数目为2n=38;核型公式为2n=2X=38=28m 10sm;染色体相对长度组成为2n=38=8L 6M2 20M1 4S。 相似文献