Дро-307型双动颚颚式破碎机

苏联试制了一台Дро-307型双动颚颚式破碎机,并进行了试验。图1 Дро-307型双动颚颚式破碎机断面图这种破碎机的优点是,生产能力高和破碎板消耗低,这对高强度和磨损性矿石的破碎有较大价值。破碎机有二个类似复杂摆动式颚式破碎机的颚板,二个动颚轴之间用二个诺维科夫齿轮(圆弧面齿轮)连接(图1)。由于偏心轴呈对称布置,所以颚     

高效节能颚式破碎机

沈阳黄金学院新设计的多腔连续破碎机具有高效、节能、节省钢材、破碎比大、运转平稳等特点。该机将旋回破碎机的优点与颚式破碎机的优点结合起来,其主要结构是在动颚的两面都装上衬板,在机架内组装两个动颚时,则两个动颚间形成一个破碎腔,各动颚又分别与组装在机架上的两个     

颚式破碎机衬板的制造方法

本项发明公开了一种颚式破碎机衬板。包括动颚衬板和定颚衬板，在所说的每块动颚衬板和定颚衬板的中、上部位把原来三角形的条形齿改变为一个个独立的圆锥形齿，利用这样的衬板工作时，由于减少了衬板与石块的挤压时的受力面积，而大大的增大了衬板对石块的压强的同时，相应的使偏心轴的抗力得到大大降低，最大优点是能够大大的减少了断轴，轴承损块，机体断裂等等恶性事故的发生，可为各企业直接的或间接的提高经济效益创造条件。     

双动颚颚式破碎机仿真分析及应用

物料的破碎是矿冶、化工和建筑等领域中一个重要的工艺流程,颚式破碎机是最常用的破碎设备之一。为了提高颚式破碎机的效率、节能等性能,需要对颚式破碎机结构进行改进设计和性能分析。通过对双动颚颚式破碎机进行运动仿真、动力学分析,得到了其工作过程中的运动参数,为破碎机的优化设计提供了数据支持,并介绍了双动颚颚式破碎机的优势及实际应用情况。     

针对硅铁破碎的双动颚破碎机

为解决硅铁破碎中需要提高成品率以及降低粉末在非成品中占比的问题,针对硅铁自然块外形及硬度特点,设计了一种同时具有两个动颚的双动颚破碎机。根据"劈碎"比"揉碎"产生粉末更少的原理,提出了一种双动颚破碎机,然后进行了仿真和小批量带料试验,确定了两块动颚的相对运动轨迹、运动频率比、运动幅度、破碎力、破碎角度等参数。最后进行了现场批量试验,并与通常的单动颚破碎机进行了比较。结果表明,双动颚破碎机对于硅铁破碎,成品率更高、颗粒均匀、粉末样在非成品中占比少、有效避免了大而硬样品的破碎卡阻,更符合硅铁破碎高成品率的要求。     

基于ANSYS的WC-Co涂层对颚式破碎机齿板应力影响分析

针对PE 250×400颚式破碎机的齿板在使用中磨损严重的情况,提出在齿板齿面覆盖WC-Co涂层的方法,来降低齿板磨损,延长齿板使用寿命。采用模糊随机理论将最大破碎力分解至各齿上以分析齿板受力状态,通过Pro/e软件对颚式破碎机齿板实体建立模型,利用ANSYS 软件对齿板在不同厚度、不同涂层成分条件下的齿面应力进行分析,获得喷涂合适的厚度与喷涂材料,为今后颚式破碎机的研究与应用提供理论基础。     

PE1200×1400复摆颚式破碎机研究与应用

城门山铜矿选矿厂破碎系统中,颚式破碎机因设计不合理,破碎效果差,设备运行状态检测能力弱,颚破腔堵斗现象时常发生,排矿口调整困难。通过对颚式破碎机动颚运动轨迹、齿板结构形式、破碎腔型、排矿口调整装置、设备运行监测进行研究,解决了颚式破碎机经常性堵斗、排矿口调整困难等问题。     

破碎机颚板堆焊组织性能分析

选择了三种焊材对颚式破碎机颚板工作区域进行堆焊修复,通过对堆焊前后颚板样品的化学成分、硬度、冲击韧性、耐磨性能、微观组织的分析,确定性价比最高的焊接材料,从而延长颚板的使用寿命,降低企业采购及生产成本。     

复摆颚式破碎机机构分析

本文从提高颚式破碎机机构效率出发，对复摆颚式破碎机进行了运动和动力分析，并提出了平衡其惯性力的措施，为破碎机机构分析的计算机辅助设计提供了一种方法。     

颚式破碎机在残极破碎中的应用

本文针对我公司鄂式破碎机在残极破碎中的应用进行探讨和研究。对破碎机的啮角、动颚摆动行程、曲线破碎腔进行了改进设计。从目前的应用效果分析,其工作效率远高于同类产品,其结构简单、辅机少,利于维护操作,使生产过程高效便捷。     

鄂式破碎机破碎故障分析

本文主要介绍鄂式破碎机的分类、故障分析及处理方法。复摆鄂式破碎机破碎故障有许多原因造成。通过生产实践和理论分析得出破碎故障的解决方案。分析过程和解决方案是生产时处理此类故障的参考。同时,这也是后续设计中对鄂式破碎机进行改进的重要依据。     

颚式破碎机主参数破碎力的研究

本文给出了速度瞬心的解析关系,并分析了速度瞬心在各位置的变化规律,从而获得了颚式破碎机主参数－－破碎力的计算公式。     

Jaw lesions resulting from renal hyperparathyroidism in a young dog--a case report

A five-month-old male Labrador retriever presented with massive bilateral jaw and facial swelling. Ulcers were found on the buccal mucosa and palate, and the jaws were flexible on firm palpation. The dog could eat only soft food and was underweight. Renal hyperparathyroidism was diagnosed based on serum chemistry screen, parathormone concentration, radiological findings and histopathology. The dog was euthanatized because of an extremely poor prognosis.     

用SOLIDWORKS对复摆颚式破碎机进行三维模型图设计

运用Solidworks2001软件建立了复摆颚式破碎机的三维实体模型，提出了三维模型建模的基本思路和方法。     

PEJ1215颚式破碎机后肘板的强度分析计算

因PEJ1215简摆颚式破碎机在现场使用时多次出现后肘板断裂问题,本文通过对后肘板进行静强度和疲劳强度分析,得出比较合理的改进方案,从而预防了肘板断裂问题。     

Jaw muscles of Old World squirrels

The jaw, suprahyoid, and extrinsic tongue muscles were studied in 11 genera, belonging to five tribes, of Old World squirrels. Significant variation in most of the adductor muscles is evident. The most primitive state of sciuromorphy is seen in the African tree squirrels Paraxerus and Funisciurus, especially as reflected in the anterior deep masseter. A derived state of sciuromorphy is found in five genera of Old World squirrels and perhaps evolved independently in each. Reduction of the temporalis muscle was observed in three genera, distantly related to one another. A unique arrangement of the superficial masseter is reported in the Asian giant tree squirrels, Ratufa. The arrangement of the masseter in the African pygmy squirrel, Myosciurus, is very similar to that of the South American pygmy squirrel, Sciurillus. We present hypotheses about the functional significance of these differences. In the derived state of sciuromorphy, which is found in three cases in squirrels that feed extensively on hard fruits, the anterior deep masseter is well positioned to increase the strength of the power stroke of the incisor bite. Among the pygmy squirrels, the position of the anterior deep masseter suggests that it plays a more significant role in molar chewing.     

Effects of contrastive emphasis on jaw opening

This paper examines the effect of contrastive emphasis on the amount of vertical jaw displacement, as measured from X-ray microbeam data, for 3 American English speakers. Jaw opening in short utterances with one word emphasized (in initial, middle, and final positions) was compared with that of similar utterances with no words emphasized. The results suggest that emphasis involves not only a significant increase in jaw opening on the word emphasized but also possibly a reduction of jaw opening on the word following emphasis. Emphasis in addition may affect the amount of jaw opening of the utterance as a whole, in terms of a decrement in jaw opening on all the remaining words in the utterance following the emphasized word. The relationship between jaw opening and hierarchical levels of prosodic structure is tentatively discussed.     

Assay of bropirimine in rat plasma by means of robotic solid-phase extraction and high-performance liquid chromatography

Vacuous jaw movements induced by the muscarinic agonist pilocarpine and striatal dopamine depletions were examined using a slow motion videotape system. With this procedure, rats were videotaped in a Plexiglas tube so that the profile of the head region could be seen. Vacuous jaw movements were analyzed by examining the tape at 1/6 normal speed. An observer recorded each jaw movement using a computer, and the computer program re-calculated the temporal characteristics of jaw movement responses back to normal speed. The interresponse time was recorded for each jaw movement, and each jaw movement interresponse time was assigned to a 50 ms wide time bin. Thus, the distribution of interresponse times could be used to analyze the temporal characteristics of jaw movement responses. In the first experiment, rats were administered saline vehicle, 1.0 mg/kg and 2.0 mg/kg pilocarpine. The rats were videotaped 10-15 min after injection, and the data were analyzed as described above. Pilocarpine induced very high levels of vacuous jaw movements, and the vast majority of all movements occurred in "bursts" with interresponse times of 1.0 s or less. Analysis of the interresponse time distributions showed that most of the jaw movements were within the 150-350 ms range. The modal jaw movement interresponse time was in the 150-200 ms range, which corresponds to a local frequency of 5-6.66 Hz. In the second experiment, the neurotoxic agent 6-hydroxydopamine was injected directly into the ventrolateral striatum in order to produce a local dopamine depletion. The dopamine-depleted rats were observed for jaw movements 7 days after surgery. The overall level of jaw movement activity resulting from dopamine-depletion was much lower than that produced by pilocarpine. There was a significant inverse correlation between ventrolateral striatal dopamine levels and total number of vacuous jaw movements. Videotape analysis indicated that the temporal characteristics of jaw movements induced by dopamine depletions were similar to those shown with pilocarpine. These experiments indicate that vacuous jaw movements induced by pilocarpine and striatal dopamine depletion occur in a frequency range similar to that shown in parkinsonian tremor.     

Effect of jaw opening on the direction and magnitude of human incisal bite forces

The maximum bite force (MBF) appears to be different when measured at different jaw openings (e.g., Manns et al., 1979; Mackenna and Turker, 1983; Lindauer et al., 1993). However, the change could be related to a change in the bite direction. We have measured the MBF on incisors and its direction in three dimensions for different jaw openings in ten subjects. Surface electromyography (EMG) of anterior temporalis and masseter muscles on both sides was recorded simultaneously. The results showed that: (1) the average %MBF increased as the jaw was opened, reached a plateau between 14 and 28 mm of incisal separation, and then decreased at wider jaw openings; (2) the initial forward bite direction with respect to the mandibular occlusal plane shifted backwards during jaw opening; and (3) the activity of the masseter muscles declined and that of the temporalis muscles was largely unchanged, resulting in an increase of the ratio between the activity in temporalis and masseter muscles (T/M). There was a significant correlation between bite direction and jaw opening (r = 0.51, p < 0.001) and between T/M ratio and jaw opening (r = 0.56, p < 0.001). Based on comparative data, we have calculated sarcomere lengths while the jaw is opened and hypothesize that the average %MBF reaches its maximum when the sarcomeres in the masseter muscle achieve their optimum length. A plateau continues during further jaw opening, until those of temporalis reach their optimum length while those of masseter lengthen beyond their optimum length. The change in bite direction was attributed to either a change in the relation between upper and lower bite points as the jaw was opened or the gradual decline of masseter activity at larger openings.