共查询到19条相似文献,搜索用时 109 毫秒
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我厂使用的双辊挤浆机又称为沟纹挤浆机,是利用一对带沟纹的辊子挤压浆料的设备。与螺旋挤浆机比较,浆料挤压力大,作用时间较短。1工作原理将浓度约10%的浆料以一定的压力,用螺旋输送机送入密闭的浆槽内,浆槽内置一对沟纹压辊,压辊表面有一系列的沟缝,在挤压过程?.. 相似文献
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《林业机械与木工设备》1998,(10)
防火板制板机该制板机的机架由若干框架组成,每个框架上设置一组皮带输送机。机架上装有由两组承布架和一对水平对滚组成的承布承料部件,由一对竖向对滚组成的第一压辊和第二压辊,及由切刀和行走小车组成的自动切割部件;机架后端装有由承料架和控制机构组成的自动落料... 相似文献
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刘云龙 《林业机械与木工设备》2000,28(9):23-24
我公司于 1996年底,全线引进克瓦纳-比松公司的连续辊压式中密度纤维板生产线。该设备的技术水平为90年代初的世界先进水平。但在使用过程中,发现伯斯道夫公司的40F连续压机的控制系统在设计上存在一定的问题。我们在试生产及调试过程中选用了带远程站的PLC系统对其进行改进。1生产工艺 连续压机位于生产线中部,由一个4m直径的主压辊、一个2m直径的导向压辊、两个1.5m直径的辅压辊、一条36m长2.5m宽的钢带、钢带调偏系统、蒸汽调节站、机架、润滑站、液压站等组成。由板坯运输机送来的板坯,经导向辊进入压… 相似文献
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在运动学和动力学分析的基础上,就平模成型机压辊产生的滑动作用进行讨论分析,研究产生最大动压力所需要的条件,为平模成型机的优化设计提供理论依据。结果表明:平模成型机压辊的滑动作用是有利于物料压缩成型的,在一定程度上增加物料的预压缩行程。数学模型的建立有利于平模成型机精确控制压辊的运动状态,提高成型机的工作效率。 相似文献
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林机制造中热处理新法三例吴贵成(辽阳县苗圃110200)根据本人在辽宁省林业机械厂多年的理论与试验相结合的生产实践,现推荐3种典型工件的热处理新法。1锯条辊压机压辊的热处理该件是校正锯条变形的承压件,材料为Ts,其硬度要求为HRC58~62,淬透层深... 相似文献
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阐述胶合生产的关键设备--旋切机的研发过程,及各种旋切机的优缺点,并详细介绍有卡-无卡组合式旋切机、辊压连续式单板干燥机和网辊复合式单板干燥机,及单板纵向接长机组的结构和工作原理,为胶合板类生产企业技术改造和设备选型提供参考. 相似文献
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选用泥炭(PE)和菇渣(MR)作为主要基质材料,配以珍珠岩和蛭石制成育苗基质,研究了无纺布容器育苗成型机的成型过程对基质物理性质的影响。结果表明:育苗成型机的成型过程显著增加了育苗基质的容重,但其对PE育苗基质容重的影响显著大于MR;且基质中珍珠岩的含量越高,成型过程对容重的影响越大。同PE相比,成型过程对MR基质总孔隙的影响相对较小。育苗基质中蛭石的添加比例增加,经育苗成型机的成型过程后,育苗基质的通气孔隙降低幅度提高;而珍珠岩比例增加,基质的总孔隙度、通气孔隙和持水孔隙的降低幅度增加。不同组分的育苗基质经成型过程后,田间持水量显著降低,持水能力明显下降。 相似文献
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着重介绍了过山车轨道的三维建模方法,通过该方法可以建立准确的过山车轨道三维模型,为以后对过山车进行动态仿真以及运动学和动力学分析打下基础,有效提高过山车的安全性能。 相似文献
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This paper took the upper-lower wide belt sander B229 with four-feet wide belts, manufactured in China, as the study target.
By means of framework dynamic design, we study its vibration characteristics by commencing from the place having horizontal
defects and used experimental modal analysis (EMA) and power spectrum density (PSD) to observe the sanding parts and the whole
machine, respectively. In the modal test, we mainly adopted the cross spots testing method to get the frequency response function
of the fixed spots to every excitation vibration spot, then applied the SISO frequency response function and the frequency
response function fitting method to identify and complete parameter recognition, respectively. The typical frequency response
function chart of the whole machine and its sanding parts, as well as its second-order mode charts of contacting roller, were
obtained. Through PSD analysis, we can get the amplitude-frequency spectrum and drive frequency.
Translated from Scientia Silvae Sinicae, 2005, 41(6): 132–137 [译自: 林业科学] 相似文献
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Across the southeastern United States, changing disturbance regimes threaten the integrity of pine flatwoods, reducing their suitability as habitat for a variety of avian species, many of which are considered of conservation priority. Prescribed burning and roller chopping are management practices widely used in pine flatwoods to control shrubs and increase the growth of herbaceous vegetation. However, the impacts these treatments have on this system and its associated avian communities are largely unknown. We examined the effects of prescribed burning and roller chopping on pine flatwoods avian communities using a paired sample approach. Avian communities were compared between treated (e.g., burned) and untreated areas. We considered abundance and richness of all birds, but also groups of conservation concern, and those likely impacted by seasonal management practices (e.g., breeding and non-breeding categories, and woodland, successional-scrub, and grassland guilds). Dormant season burning resulted in decreases in avian species richness and abundance within the non-breeding, overwintering community. In situations where the maintenance or enhancement of this avian group is desired, growing season burning appears beneficial and should be used in preference to dormant season burning. Growing season burning benefited breeding avian communities, resulting in increases in species richness and abundance within this group. Dormant season roller chopping had no effect on species richness or abundance of any avian category or guild. Increases in abundance within breeding avian communities were observed following growing season roller chopping and a roller chopping/burning combination. Grazing, did not mediate the effects of prescribed burning or roller chopping on avian species richness or abundance. The use of dormant season burning is likely inappropriate in situations where conservation and management of non-breeding, overwintering species is a priority. The use of growing season roller chopping appears to provide a potential treatment alternative in situations where positive effects on breeding species are desired. Overall, maintenance of avian abundance and richness may be best achieved through the diverse application of prescribed burning and roller chopping based on season, frequency, and space. 相似文献