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目前地质岩芯钻机使用的给进机构型式多样，但主要型式有四种：一是手把式的给进机构（有的已改成手轮式的）；二是制动器自动给进调节器，又称钢绳减压给进机构；三是油缸油压给进式；四是全液压钻机中采用的液压马达直接驱动的封闭链式的给进机构。一、手把式的给进机构。由于各人的体力与精力关系以及操作熟练程度的不同，压力控制是无法均匀的，也就无法满足金刚石钻进工艺要求，不可能做到均匀连续的给进，因此不适应金刚石钻进。 相似文献
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对手把式给进机构和行星式给进机构进行了对比分析，介绍了一种实用的行星式给进机构的参数和特点。 相似文献
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我队在58年大跃进中,把300米钻机改装为双给进把,试用结果良好。改装方法很筒单:加长原来300米钻机的给进轴1(如图),并把一个给进装置(给进把2和给进槽轮3)装在立轴4 的另一边。它的主要优点是:制造简单、操作方便, 又便于调解井内压力,加压减压都可以。在浅井操作时(100米以内),将一个给进把 相似文献
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钻机所采用的液压给进系统,从结构上看型式很多,但从工作原理来看,只有两类.一类是给进力为独立的可调参数,与钻进速度无关:另一类是给进力为可调参数,但与实际钻进速度有一定的关系. 第一类称为定压给进系统,典型油路如图1,其附加给进力为: F_加=P_上f_上F_减=P_下f_下式中F_加、F_减-给进系统的附加给进力,公斤: P_上、P_下-油缸上、下腔中的油压力,公斤/厘米~2: f_上、f_下-油缸上、下腔的承压面积,厘米~2.我国XU300-2型,瑞典泰美克250型等钻机的给 相似文献
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本文综合了国内外水井钻机给进机构型式，详细给出了双向自紧油缸钢丝绳连续给进机构的设计方案。 相似文献
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冲击钻进需要的给进压力不大,但是钻进速度很低。回转钻进可以达到很高的钻进速度,可是在坚硬岩石特别是在坚硬砂岩中,即使想达到较高的钻进速度亦需要很大的给进压力。采用冲击回转钻进在较小的给进压力下亦能达到很好的钻进速度;钻进泥质页岩时,当钻进速度超过一定限度,这种钻进方法所需的给进压力较回转钻进要大。所以,冲击回转钻进不适用于这种岩石。图1表示使用这三种方法钻进三种岩石时钻进速度与给进压力的关系曲线,这三种岩石是较软而富有摩擦性的达尔里-吉尔砂岩(英国),最坚硬的石炭纪平南特砂岩和柯尔奴艾尔花岗岩。图1上曲线 相似文献
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给进装置是车载钻机的主要执行机构之一,其性能直接影响钻机技术性能的发挥。目前,全液压车载钻机的给进装置大多采用的是两根油缸通过钢丝绳带动动力头运动的伸缩桅杆式结构,结构紧凑,给进行程长。在分析全液压车载钻机给进装置主要工序和负载特性的基础上,ZMK5530TZJ100型车载钻机设计了双泵、双回路控制的液压控制系统,满足快速起下钻及精确钻压控制的正常钻进需求;通过油缸无杆腔贴装防爆阀实现给进装置的可靠悬停功能,避免管路破裂或误操作时钻具自由下落造成的顿钻事故,两个防爆阀可以同步控制油口,并联在一起使两个给进油缸的无杆腔压力相等,保证两油缸同步运行。ZMK5530TZJ100型车载钻机在晋城寺河矿完成了1 675 m的“L”形试验钻孔,验证了给进回路设计的合理性和可靠性。 相似文献
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15000Nm钻机试验台测试系统设计与应用 总被引：1，自引：0，他引：1
由于煤矿坑道钻机钻进能力的提高,原有的钻机试验台已不能满足测试转矩超过6 000 Nm钻机的需要,为此,新建了煤矿坑道钻机试验台。新系统包括硬件和软件2部分,其最大测试转矩达到15 000 Nm,最大给进力/起拔力达到300 kN;采用智能化仪器,减少了计算量,提高了工作效率;软件系统具有扩展性强、复用性高、可进行灵活控制的特点;系统具有断电保护功能。新测试台与原试验台的比对试验表明,2个试验台得出的结果一致。 相似文献
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N. H. Hashimi 《Mathematical Geology》1981,13(4):291-301
A comparative study of the moment and graphic size parameters was undertaken on about two hundred surficial sediment samples varying from sand to clay sizes from the western continental shelf of India. The studies reveal that the mean size and standard deviation may be calculated either by the moment method or by graphic methods (Inman; Folk and Ward) without any significant differences, as the methods are highly correlated. Moment and graphic skewness show less comparability than the mean size and standard deviation. The moment and graphic kurtosis estimate different properties and are not comparable. 相似文献
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M. Radha Krishna 《Journal of Earth System Science》1995,104(4):693-706
A detailed seismicity map of the Central Indian Ridge for the period 1912–1993 is presented, and the earthquakes pertaining
to four major transforms offsetting the ridge are utilized to study the moment release pattern. The scalar moment release
for the period 1912–1993, and the summed moment rate tensors for both short period (1977–1993) and long period (1912–1993)
bring out a unified picture of moment release pattern.
The fraction of seismic slip calculated based on depths of 100°C and 400°C limiting temperatures suggests that the Marie-Celeste
transform requires a slip almost to a depth of 400°C isotherm to account for the observed moment, and the Argo transform requires
depth of faulting much above the 400°C isotherm. A very small fraction of slip is accounted seismically for Vema (53%) and
12° 12′S (23%) even to depths of 100°C isotherm, suggesting a very low order of moment release along these transforms.
The horizontal plate velocities and the corresponding strain rates obtained from moment tensor summation of long period data
(82 years) give rise to (V
y
y
; V
y
x
mm. yr−1) of 6.0 and 6.1 along Marie-Celeste, 1.3 and 0.50 along Argo, 0.06 and 0.06 along 12° 12′S, 1.6 and 0.25 along Vema transforms.
The corresponding strain rates (ε
y
y
;ε
y
x
× 10−15 S−1) are 12.7 and 6.8 along MarieCeleste, 6.9 and 1.4 along Argo, 0.27 and 0.14 along 12° 12′S, 7.3 and 0.58 along Vema transforms.
These results suggest that the strain rates were highest and almost all predicted motion is taken up seismically along the
Marie-Celeste transform. The strain rates are lower along Argo transform and the observed moment release require shallower
depth of faulting in order to slip to be accounted seismically. The Vema and 12° 12′S transforms are characterized by low
strain rates and less than 15 per cent of motion is accommodated seismically within the seismogenic layer. It is proposed
that the deficiency of moment release along the Vema and 12° 12′S multiple transform system may be due to most of the plate
motion occurring aseismically. 相似文献
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扩展简化Bishop法的取矩中心对安全系数的影响 总被引：3，自引：0，他引：3
扩展简化Bishop法的提出,为非圆弧滑面安全系数的求解提供了一个简便的途径。然而,在建立滑体总体力矩平衡方程时选择不同的取矩中心会得到不同的计算结果,这在某种程度上限制了该法的应用推广。为此,针对不同类型的滑面（组合滑面、折线滑面）,较为系统地研究了取矩中心对安全系数的影响规律,并提出了确定取矩中心的原则。算例分析表明：无论哪种类型的滑面,只要选择合适的取矩中心扩展简化Bishop法便可得到与严格法（Morgenstern-price法）相当的计算精度,且该法数值计算简便,具有较高的实用价值。 相似文献
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利用惯量椭圆进行岩石有限应变分析 总被引：3，自引：0，他引：3
提出了利用惯量椭圆对任意形状矿物颗粒进行描述的方法,并利用惯量椭圆理论,计算了岩石薄片中任意形状矿物颗粒的惯量椭圆,通过颗粒面积对椭圆参数进行标准化,得到每一矿物颗粒的等效应变椭圆。等效应变椭圆能够有效地反映对应矿物颗粒的优选方位以及变形特征,进而利用椭圆的矩阵参数形式对等效应变椭圆进行统计分析,获得岩石的有限应变椭圆;同时给出了相应的数值计算方法,编制了软件Straindesk,并得到了成功的应用。该方法克服了先前应变测量中的局限性,方便实现计算机的自动分析,具有较强的有效性和广泛的适用性。 相似文献
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XING Lida WU Jianghao LU Yi L Junchang JI Qiang Institute of Geology Chinese Academy of Geological Sciences Beijing China School of Transportation Science Engineering Beijing University of Aeronautics Astronautics Beijing China 《《地质学报》英文版》2009,83(1)
The Nyctosaurus specimen KJ1 was reconstructed under the hypothesis that there is a membrane attached to the crest;the so-called headsail crest.The aerodynamic forces and moment acting on the headsail crest were analyzed.It was shown that KJ1 might adjust the angle of the headsail crest relative to the air current as one way to generate thrust (one of the aerodynamic forces,used to overcome body drag in forward flight) and that the magnitude of the thrust and moment could vary with the gesture angle and ... 相似文献
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The devastating earthquake (mb = 6.6) at Chamoli, Garhwal Himalaya, which occurred in the morning hours on 29th March 1999,
was recorded on Delhi Strong Motion Accelerograph (DSMA) Network operated by the Central Building Research Institute, Roorkee.
In this paper the source parameters of this event calculated from the Strong Motion Data are presented. The seismic moment
for this event has been found to be of the order of 1025 dyne.cm and the moment magnitude has been calculated in the range of 6.53–6.69 at different stations. The stress drop and
source radius for the earthquake are also calculated. 相似文献
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邓本让 《吉林大学学报(地球科学版)》1988,(4)
利用随机变量的特征函数来定义中心矩量,并研究两类矩量之间的相互关系,这是一个新的课题。本文目的是寻求新的途径,在多元随机变量的情况下,应用特征函数建立各阶中心矩量与原点矩量之间的一般表达式。 相似文献