Rill cut and fill method Application of low caving coal hydraulic support in thick coal seam with large tilt angle 倾斜分层充填采煤法低位放顶煤液压支架在大倾角厚煤层中的应用
In production of SAW pipe, welding seam protruding is a general forming defect, especially in the production with small forming angle. 前言:螺旋焊管生产中,成型缝“翘嘴”是普遍存在的一种成型缺陷,在采用小成型角生产时表现尤其突出。
Coordination of Full-mechanized Mining Equipments and Powered Support Design for Extremely Thin Coal Seam with Large Angle 大倾角极薄煤层综采设备配套及液压支架设计
The experimental results demonstrate that: as to the influence on seam smoothness of worsted wool fabric, the angle cutting and the wool fiber content are more significant impact; 实验结果表明:织物的丝绺角度与织物中羊毛纤维的含量对缝纫平整度的影响较为显著;
According to the model of the welding position, giving a weld seam point, the weld orientation then can be resolved from the weld rotation angle and the weld slope angle. 根据焊缝位置的数学模型,得到了描述焊缝焊接位置的参数&焊缝转角和焊缝倾角与焊缝姿态的关系。
Measures for Increasing Unit Output of Fully Mechanized Face in Seam with Large Dip Angle 提高大倾角煤层综采工作面单产的措施
Prospect of roadway arrangement reform under the condition of thick seam with large dip angle 大倾角厚煤层条件下巷道布置改革的前景
Relationship curves between seam dip angle, horizontal section height and roof deformation are derived, at the seam time, the criterion of failure is given in this paper. 得出了煤层倾角、水平分段高度对顶板变形的影响关系曲线,同时,给出了顶板破断的判据。
There are series problems exist in the existing thick seam mining technology with large dip angle, thus cause low extraction rate, poor safety and high cost. 现有的大倾角厚煤层开采技术存在着一系列问题,从而导致煤矿回采率低,安全性差,成本高。
Manganese resources in China is characterized by poor ore, thin seam and dispersal, Complicated structure, variable, thickness and slope angle, unstabilized roof and floor. 我国锰矿资源贫多富少,薄而分散,构造复杂,矿体厚度、倾角变化较大,顶底板不稳定,开采条件复杂。
The results of the gas outburst simulation experiments showed that there was no difference in an air-flow reverse phenomenon in air inflow roadway between the upward ventilation and downward ventilation when the seam angle is ranging from 0 to 32 °. 煤层倾角在0~32°内变化,突出瓦斯相似模拟实验结果,看不出上行风和下行风对进风平巷风流逆流现象有何差别。
The software system adopts a process-oriented computing model, which sufficiently considers the welded seam, sheet thickness, join angle and their influences to sheet metal manufacture process. 软件系统采用面向制造工艺的计算模型,充分考虑了板厚、坡口角度及焊缝对钣金加工的影响。
Techniques and practice of against tilting and slipping of machine mining equipments in three soft ( soft coal seam, soft roof, etc.) working faces at big dip angle 三软大倾角综放工作面设备防倒防滑技术与实践
Technical Research of Thick Coal Seam with Deep Dip Angle 大倾角厚煤层开采技术研究
Test results indicate that the effect of seam tracking is fine when warp angle is within 8 degree. 实验结果表明,本系统在8度偏角内的焊缝跟踪效果良好。
Test shows that this way can exhibit good result to butt joint and lap joint of TIG welding and accurately abstract welding seam out, to the welding seam of large magnitude dogleg angle shows good tracking effect ( dogleg angle < 68 °) and procession speed < 100 ms. 实验表明,系统对TIG焊的对接和搭接焊缝有很好地处理效果,对大幅度折线焊缝也能很好的跟踪(折线角>68°),处理速度>100ms。
The thickness arid roof-and floor-elevation of the accumulating layer beds are very closely interrelated to the distance in alignment direction, and very closely related to the mine seam slanting angle in inclination direction. 沉积矿床的厚度及顶底板标高在走向方向上与距离强相关,在倾向方向与矿层倾角强相关。
Basic behaviour of strata movement in seam with deep dip angle 大倾角煤层开采岩移基本规律的研究
The results show that ballistic performance of welded seam and HAZ calculated by safety angle method can achieve over 80% of parent metal's. The ballistic performance of welded seam by electron-beam welding and MIG welding is more than 90% of parent metal's. 试验结果表明:在安全角测试条件下计算焊缝及热影响区的抗弹性能可以达到母材的80%以上,其中采用MIG焊和电子束焊的板材焊缝抗弹性能可达到母材的90%以上;
Based on the simulated experiments, number calculations and the spot investigations, the quantity indexes of the coal seam angle complexity and coal seam thickness complexity were set up; they also were applied in concrete engineering example: Dongxia Coal Mining; 基于相似模拟实验、数值计算、现场调研建立了煤层倾角、煤层厚度复杂性量化指标,应用于具体工程实例:东峡煤矿,得出东峡煤矿煤层倾角复杂度、煤层厚度复杂度和地质条件复杂度。
The article introduces the shortwall mining method along strike in medium-thickness seam with great dip angle, which is based on individual hydraulic prop and has brought great economic effect. 在大倾角中厚煤层推行走向短壁采煤方法,使用单体液压支柱,取得较好的技术经济效果。
Based on theory analysis and practical survey in testing ground, had studied influence factors such as caving height, work resistance of supports, coal seam rupture angle, main roof rotary angle and stopping mining time. 通过理论分析和现场实测,研究了采高、支架工作阻力、煤体破裂角及节理面倾角、老顶回转角和停采时间等对采煤工作面煤壁片帮的影响。
This paper analyzes the reliability of inclined longwall and along strike longwall mining, and provides the mining technology at different coal seam angle. 在不同的煤层倾角下,对倾斜长壁与走向长壁开采工艺进行可靠性分析,从而得出煤层有不同倾角范围应选择的采煤工艺。
The results obtained showed that with a transverse seam in front of wing angle, the effects of flow separation were weakened, hence lead to the minimum wing angle that produced flow separation increased. 结果表明,由于翼角前有一条横缝,分离效应减弱,导致产生分离的最小翼角增大。
According to the fully mechanized mining practice on coal seam with great tilt angle between 23? to 32? and "three-softening" coal seam by Pingdingshan Coal Industry Croup, study the characteristics of mining process and technical measures. 通过平煤集团在23-32°大倾角三软煤层综采的开采实践,论述了开采工艺特点及技术措施。
Then, based on the defined seam position error and seam angle error, the seam tracking controller was designed. The controller combined feedforward control and a PD feedback controller. 然后在定义了焊缝的位置偏差和角度偏差的基础上,设计了焊缝跟踪控制器,该控制器采用了前馈控制和反馈控制相结合的复合控制方法,其中反馈控制部分为PD控制器。
The results showed that, the cutting seam depth is used as vertex of the fall Angle, with the increased depth of the cut seam, the fall Angle gradually reduces. 模拟结果表明,以切缝深度作为垮落角顶点,随着切缝深度的增加,垮落角逐渐减小。
The result shows that the formability of specimen is affected by location of welding seam and the angle between welding seam and tensile direction. 结果表明,试件的成形性能与焊缝在拼焊板上的位置和焊缝与拉伸力方向的夹角有关。