共查询到20条相似文献，搜索用时 0 毫秒
1.
2.
锤片式粉碎机中物料的运动与分离浅析 总被引：3，自引：0，他引：3
<正> 锤片式粉碎机效率的高低,是由其物料的破碎能力和分离能力决定的。因此,对锤片式粉碎机理论的研究和结构型式的改造,实质上都是在探求如何获得提高这两种能力的方式方法。锤片式粉碎机对物料的破碎主要以冲击为主,破碎能力的大小,取决于锤片与物料之间的相对速度及锤片本身的锐利程度。提高粉碎机转速、在粉碎室内增加齿板、截击板等辅助破碎部件、采用阶梯形锤片等,均能达到提高对物料破碎能力的目的。分离能力的大小,除筛片本身固有的有效筛理面积外,主要取决于物料在粉碎机中的运动与分布状态。因此,研究物料在 相似文献
3.
<正> 锤片式粉碎机是饲料加工业最广泛采用的一种粉碎设备,它具有结构简单、适应性强、生产效率高、使用安全可靠等优点。近年来,国外许多公司如:瑞士比尤列尔、法国卢谢尔、美国斯勃劳特·沃德罗、英国克里斯吉·诺里斯等公司,以及苏联等国都生产了一些新机型。这些新型粉碎机反映了现代锤片式粉碎机的结构特点和先进的技术经济性能指标。这里简要作一些介绍。苏联生产的ДДМ型锤片式粉碎机(图1),是 相似文献
4.
5.
<正> 锤片式粉碎机的缺点之一是无用能量消耗较大。为了提高粉碎机的能量利用效率,改善粉碎机的工作性能,我们对筛面包角为270°、顶部进料的锤片式粉碎机进行了粉碎玉米的试验,研究了截击板对锤片式粉碎机工作性能的影响和物料出筛率沿圆周筛面的分布规律。一、截击板对锤片式粉碎机工作性能的影响物料进入粉碎室后受到锤片打击,立即加速运动而沿粉碎室外缘形成不利干粉碎的环流层,并且随锤片一起作环流运动,从而使得粉碎机的生产效率低、产品质量差。设计者应在结构上采取某些对策破坏这一物料环流层。主要对策有以下几种:①偏心式粉碎室;②水滴形粉碎室;③涡流式粉碎室(图1)。 相似文献
6.
横宽形振动筛锤片式粉碎机的主要特点是：饲料的粗粉碎和超细粉碎两者可以通用;效率高;粉粒比较均匀;对水分较高的原料和含纤维的原料有较好的适应性;易损件筛片寿命长;锤片更换周期长等。横宽形振动筛锤片式粉碎机由电动机、多层筛体（筛体分内层筛和外层筛）、振动器、机体等组成,它的技术特征是具有横宽形振动的多层筛。１横宽形振动筛锤片式粉碎机粉碎粗饲料特点１．１粉碎粒度均匀,物料粉碎和物料分级时间错开粗饲料（以３ｍｍ为例）生产时,原料进入粉碎腔,受到高速旋转的锤片锤击,粉碎机内筛是孔径为８ｍｍ的粗筛,厚度８ｍ… 相似文献
7.
锤片式粉碎机负荷程度与性能指标关系的研究 总被引：1，自引：0，他引：1
<正> 在锤片式粉碎机性能测试中,有人以为增加粉碎机的负荷程度能提高粉碎机的性能指标,这种看法是片面的。本文根据我们对部分锤片式粉碎机在不同工况下进行试验所取得的资料,对其负荷程度与性能指标的关系做些分析。试验中负荷程度ε的 相似文献
8.
《饲料工业》2017,(21):10-13
在锤片式饲料粉碎机内部,以环流层为界,可将气流分为加速流和自由流。自由流不仅对饲料颗粒产生曳力作用,影响饲料的粉碎、破围和收集,而且对粉碎机能耗大、饲料过粉碎、饲料温升高、锤片磨损严重等问题也较大的影响。为了较为准确地预报自由流的流动状况,该文采用数值模拟的方法,对其速度场、压力场和湍动能场的分布特征和变化规律进行深入分析。结论认为,气流在粉碎腔上部的大幅度降速不利于自由流的下行,会影响饲料的粉碎、破围和收集;湍动能场的存在是引起气流大幅度降速的直接原因,可适当改进结构以减小湍动能场的分布范围。该研究结论可为锤片式饲料粉碎机的结构改进和相关领域的研究起到参考作用,也可完善锤片式饲料粉碎机研究的基础理论。 相似文献
9.
Mark Heimann 《饲料研究》2010,(3)
<正>1锤片式粉碎机和超微粉碎机与超微粉碎机相比,锤片式粉碎机效率高、发热少且吸尘要求低。根据饲料配方和粉碎细度,装有普通硬合金锤片和圆孔筛的锤片式粉碎机的维护费用通常是0.02～0.1美元/t,电力成本约0.25～1美元/t。而超微粉碎机消耗2～4美元/t或更多,在许多情况下,零件磨损费超过0.25美元/t。 相似文献
10.
<正>锤片式粉碎机广泛运用于化工、医药、食品、饲料等多个行业,是一个能耗非常高的设备,在生产工艺中占据了能耗的30%～50%,因此提高锤片式粉碎机的粉碎效率是降低能耗的重要途径之一。1锤片式粉碎机粉碎机理及现状 相似文献
11.
试验以美国转基因大豆为原料,研究了粉碎过程中不同水分含量(13.21%、14.82%、16.71%)和筛孔直径(2.02、.53、.0、3.5 mm)对粉碎产品粒度的影响和不同挤压膨化温度(130、140、150℃)、不同粒度和不同水分含量对膨化大豆中脲酶活性和蛋白质溶解度的影响,筛选出加工膨化大豆的最优工艺条件。研究结果表明,大豆粉碎粒度随水分含量和筛孔孔径的增大而增大;大豆最佳挤压膨化加工参数为:水分含量13.21%,筛网孔径3.5mm,膨化温度130℃。在此加工参数条件下,膨化全脂大豆的脲酶活性为0.248 U/g,蛋白质溶解度75.52%。 相似文献
12.
锤片式饲料粉碎机是饲料加工厂的主要粉碎设备,文章分析了粉碎机产生振动原因,介绍了减震器的布置、安装与维护,选择减震材料、类型和应用,综合给出减震器核算步骤和计算公式,并用例题说明校核过程,为设计人员和使用者提供了参考,具有一定的指导意义。 相似文献
13.
卧式锤片粉碎机是目前国内饲料厂粉碎工段的传统首选机型。该机型尽管优点不少，如适应性广、工作可靠、结构简单、价格便宜、制造维修方便等，但其问题也比较突出，即能耗大、生产率不高。原因主要有两条，一是该机型排粉效率低于其粉碎效率，二是粉碎室内形成的气物环流层，使细粉不能及时排出，造成重复无效的过度粉碎。尽管也采用了不少改进措施，如加大筛板包角、设计水滴形粉碎室、加强吸风辅助系统等，但受卧式锤片粉碎机整体结构的限制，都难以有明显成效。目前国内市场上最新出现的一种立式锤片粉碎机，有望克服上述缺点，降低能耗… 相似文献
14.
Possibilities for preservation of coarse particles in pelleting process to improve feed quality characteristics 
下载免费PDF全文
下载免费PDF全文 D. Vukmirović A. Fišteš J. Lević R. Čolović D. Rakić T. Brlek V. Banjac 《Journal of animal physiology and animal nutrition》2017,101(5):857-867
Poultry diets are mainly used in pelleted form because pellets have many advantages compared to mash feed. On the other hand, pelleting causes reduction of feed particle size. The aim of this research was to investigate the possibility of increasing the content of coarse particles in pellets, and, at the same time, to produce pellets with satisfactory quality. In this research, the three grinding treatments of corn were applied using hammer mill with three sieve openings diameter: 3 mm (HM‐3), 6 mm (HM‐6) and 9 mm (HM‐9). These grinding treatments were combined in pelleting process with three gaps between rollers and the die of pellet press (roller‐die gap, RDG) (0.30, 1.15 and 2.00 mm) and three moisture contents of the pelleted material (14.5, 16.0 and 17.5%). The increased coarseness of grinding by the hammer mill resulted in the increased amount of coarse particles in pellets, especially when the smallest RDG was applied (0.30 mm), but pellet quality was greatly reduced. Increasing of RDG improved the quality of pellets produced from coarsely ground corn, but reduced the content of coarse particles in pellets and increased specific energy consumption of the pellet press. Increasing the moisture content of material to be pelleted (MC) significantly reduced energy consumption of the pellet press, but there was no significant influence of MC on particle size after pelleting and on the pellet quality. The optimal values of the pelleting process parameters were determined using desirability function method. The results of optimization process showed that to achieve the highest possible quantity of coarse particles in the pellets, and to produce pellets of satisfactory quality, with the lowest possible energy consumption of the pellet press, the coarsest grinding on hammer mill (HM‐9), the largest RDG (2 mm) and the highest MC (17.5%) should be applied. 相似文献
15.
为提高新型锤片式饲料粉碎机的筛分效率,现利用EDEM-Fluent耦合法对该机进行数值模拟。先对EDEM和Fluent耦合计算筛分效率的准确性进行试验验证,再分别模拟不同喂料速率、不同喂料量、不同回料管直径下粉碎机的筛分效率,分析粉碎过程中物料在该机内部的分布规律以及3种影响因素分别对应的筛分效率最大值。结果表明,物料颗粒在分离装置内总体上呈外密内疏的状态,喂料速率、喂料量以及回料管直径影响粉碎机筛分效率。3次数值模拟得出喂料速率、喂料量、回料管直径分别为0.75 kg/s、4 kg、50 mm时,筛分效率最高,分别为80.00%、79.75%、81.00%。 相似文献
16.
17.
A 5‐year‐old, 520 kg Standardbred mare was admitted for an osteosarcoma of the right premaxilla. Two horizontal incisions of the labial mucosa and lingual surface were made 1 cm around the ulceration from the canine tooth to the premaxillary symphysis. The premaxilla and rostral portion of the maxilla were transected 1 cm caudal to the canine tooth with an oscillating saw. The maxillary symphysis was transected using an oscillating saw and a hammer. The wound was closed by primary intention and healed without complication. The cosmetic appearance of the mare was good. The mare was able to prehend hay and grain and grazed without difficulty and the tongue did not protrude. The neoplasm had not recurred 18 months after the surgery. A premaxilla and rostral portion of the adjacent maxilla can be resected to treat horses for a unilateral lesion of the premaxilla but care must be taken to avoid the palatine and incisive arteries which lie within the interincisive canal. 相似文献
18.
In the course of the year, the temperature and relative humidity of the insemination hall of a large pig farm were studied in ten three-week periods. The results were compared with the conception rate of sows inseminated in these periods. The macroclimatic conditions were also studied, and the influence of macroclimate (including temperature and relative humidity) on the microclimate of insemination hall was evaluated. The studied microclimate parameters were found to influence the conception of sows in the first three weeks after insemination. Highly significant differences (significance level of alpha = 0.01) were recorded in the conception of sows after the first insemination, in the occurrence of optimum and increased temperatures, in the occurrence of optimum and increased relative humidity in the summer and winter months. A significant difference at the significance level of alpha = 0.05 was found when the occurrence of increased relative humidity was compared. A high temperature was recorded only in the summer months. In summer and in the first half of autumn (from the 9th of June to the 13th of October) when increased to high temperatures and increased to high relative humidity prevailed in the insemination hall (optimum temperature only in 2.0 to 23.3% of the period; optimum relative humidity in 11.1 to 50.0% of the period), the sow conception rate after the first insemination was low (45.5 to 49.7%). In autumn the microclimatic conditions in the insemination hall returned to the optimum. From the 4th of November to the 16th of February the optimum temperature (optimum in 71.6 to 89.7% of the period) and optimum relative humidity (optimum in 74.2 to 90.7% of the period) prevailed in the insemination hall, enabling an improvement in the conception of sows after the first insemination (71.4 to 80.1%). The temperature inside the insemination hall was influenced by changes in outside temperatures whereas the relative humidity inside the insemination hall was influenced mainly by internal factors. 相似文献
19.
20.
狭翅雏蝗发育起点温度和有效积温的研究 总被引：5，自引：1，他引：5
在室外自然条件下用无芒雀麦（Ｂｒｏｍｕｓｉｎｅｒｍｉｓ）叶片饲喂狭翅雏蝗Ｃｈｏｒｔｈｉｐｐｕｓｄｕｂｉｕｓ（Ｚｕｂｏｖｓｋｙ）Ｕｖｒｏｖ，分别以直线回归法和直接最优法计算发育起点温度和有效积温，并与实际发生情况作了初步验证。全蝗蝻期发育起点温度为９．１７℃（直线回归法）或９．４１℃（直接最优法），有效积温为１９０．７０日度（直线回归法）或１７５．４４日度（直接最优法）。测定结果直接最优法计算结果较直线回归法更切合实际。 相似文献