捻制方式对钢丝绳绳丝力学性能影响研究

对6×19S+FC右同向捻及右交互捻钢丝绳绳丝分别进行了静态实验,得到它们的拉伸、弯折及扭转实验数据;对这些数据进行统计分析,分别得到它们的均值与方差,从实验层面探讨捻制方式对钢丝绳绳丝力学性能的影响。另外利用Solidworks软件建立了绳丝计算模型,利用ANSYS软件分析了钢丝绳中绳丝的受力和变形情况,从数值模拟层面探讨钢丝绳捻制方式对绳丝力学性能的影响。研究表明,对于钢丝绳绳丝力学性能而言,右交互捻优于右同向捻。

钢丝绳绳丝矫直器在制品检测领域的应用研究

钢丝绳绳丝矫直器作为一项实用技术,主要用于金属制品行业钢丝绳的检测实验室,通过批量绳丝矫直取代传统的人工用铜棒和木锤单根绳丝矫直,解决了人工矫直绳丝工作效率低,劳动强度大,试验成本高的"瓶颈"难题。本文结合贵州钢绳股份有限公司检测中心大批量实际应用,从绳丝样品U形铜槽夹持、数显载荷传感器力值控制、拉拔矫直到数据分析,说明了钢丝绳绳丝矫直器在检测系统的运用是有效的。

基于摩擦学机理的编织绳丝断裂试验装置设计

编织绳在外载荷作用下,绳股与绳股之间、绳丝与绳丝之间由于摩擦接触作用而产生应变并传递应力。当编织绳受到载荷作用而失效时,必然是从最小单元绳丝断裂开始。绳丝断裂过程中的形变阻力除了受载荷作用影响外,绳丝间的摩擦接触状态对其也有很大的影响。基于摩擦学机理,笔者提出了一种模拟编织绳绳丝间摩擦接触状态的试验方法,并自主研制了试验装置。该试验装置为软材料试样切割性能测试提供了一种切实可行的测试方法,为阐明绳丝间摩擦接触对编织绳断裂失效的作用机理提供了有力的试验数据。

高强度热镀锌制绳丝性能研究

随着国民经济的快速发展,各行业技术水平不断提升,对工业产品质量提出了越来越高的要求,其中港口、渔业、机械制造等行业使用的镀锌钢丝绳品质要求也在不断提升,对于钢丝绳的强度要求也越来越高,这样就需要将镀锌制绳丝的强度水平不断提升.由于热镀锌对于钢丝的性能有损害,因此随着强度的升高生产制造的难度也原来越大,本文经过大量实验数据总结出热镀锌制绳丝性能与钢丝强度、线径的关系,就如何提高热镀锌制绳丝性能水平提出合理的工艺方案,达到提高镀锌制绳丝性能的目的.

钢丝绳高速回撤的动力学建模与仿真

右旋顺捻钢丝绳在高速回撤过程中会发生右偏现象,钢丝绳在回撤末期剧烈甩动,存在缠绕滑轮和损坏周边设备的安全隐患。为评估钢丝绳在回撤过程中的风险,指导回撤轨迹规划算法设计,以多体动力学为基础建立了钢丝绳回撤过程的运动仿真模型。首先,根据“质量-弹簧-阻尼”模型,推导出钢丝绳的张力;然后,在假设钢丝绳摩擦因子有各向异性特征的条件下,建立了各向异性摩擦力学模型,分析右旋顺捻钢丝绳的右偏现象;再次,将绳丝等效为柔性梁,根据捻制钢丝绳的抗弯刚度模型推导了钢丝绳的弯矩;最后,将所有物理特性集中于节点,通过牛顿第二定律与运动学方程得到各节点的运动轨迹,并基于所建立的钢丝绳回撤运动仿真模型,分别对右旋顺捻钢丝绳和右旋交互捻钢丝绳在两种不同速度轨迹规划下的回撤过程进行了仿真分析。分析结果与试验现象相符,初步验证了所建模型的正确性。

浅析电梯钢丝绳断丝原因及改进措施

目前,电梯的应用十分广泛的同时,电梯安全问题也引起人们的普遍关注。钢丝绳是影响到电梯安全的重要部件,钢丝绳断丝、断股现象严重影响到电梯的使用安全。本文对电梯断丝原因进行了综合分析,从钢丝绳设计及选型、安装、日常维护管理等方面进行分析,提出了改进措施,旨在减少电梯事故的发生。

Experimental research on static characteristics of special wire-rope isolator

Based on analysis of the work conditions and structural characteristics of the exterior pipeline of the aero-engine, a kind of cantilever-structure wire-rope isolator fitted to the exterior pipeline of the aero-engine is designed for supporting and damping purposes. By static experiments, the static hysteresis loop, the relationship of stiffness and amplitude, and the relationship between the energy dissipation coefficient and the amplitude are obtained. Analyses show that the wire-rope isolator presents obvious hysteresis characteristics, and the characteristics of the isolator, such as stiffness and damping, behave obviously nonlinearly when the amplitude value of deformation changes. At the same time, by changing the structure parameters of the wire-rope, the wirerope isolators can be made with different functions to satisfy different work conditions. The research results have important reference values for the application of the wire-rope isolator on the exterior pipeline of an aeroengine.

Theoretical coupling longitudinal-transverse model and experimental verification of transverse vibration of rope for multi-rope friction hoisting system

Using the mass of time-varying length balance rope focused on the hoisting conveyance, the coupling longi- tudinal-transverse model of mine friction hoist was established by using of the Hamilton＇s principle. The modified Galerkin＇s method was used to discretize partial differential Eqs. The mine hoisting system was used to the example to analysis the relation between the load, velocity and transverse vibration of rope. The in situ tests were illustrated to evaluate the proposed mathematical model. The results showed that the modeling method can well represent the transverse vibration of rope.

Key technique of a detection sensor for coal mine wire ropes

Wire ropes,employed extensively in coal mine hoists and transportation systems are subject to damage due to wear,corrosion and fatigue.The extent of damage and the carrying capacity of ropes are closely related to the sense of safety by staff and equipments.Magnetic flux leakage detection method(MFL),as an effective method,is these days widely used in detection of broken strands of wire ropes.In order to improve the accuracy of detection of flaws in wire ropes by magnetic flux leakage(MFL),the effect of the distance between a sensor and the surface of a wire rope(i.e.,lift-off) on detection by magnetic flux leakage was in-vestigated.An analysis of the main principles for the choice of lift-off is described by us and a new method that improves the structure of the detector is proposed from the point of view of the design of a magnetic circuit,to restrain the impact of fluctuations of sensor lift-off.The effect of this kind of method is validated by simulation and computation.The results show that the detection sensitivity is markedly increased by this method.Furthermore,the signal-to-noise ratio(SNR) can be increased by over 28%.This method will lend itself to offer reliable scientific information to optimize the structure of excitation devices and improve the accuracy of MFL detection.

Electrochemical corrosion behavior of steel wires in a coalmine with a corrosive medium

A6×19 point-contact hoisting cable was used as our research object to examine the progress of corrosion of steel wires in a laboratory,simulating the actual working conditions in a coalmine.An electrochemical method was used to investigate the corrosion behavior of steel wires with different surface treatments of a corrosive acid solution.The results show that anode activation of steel wire mainly occurs during pre-corrosion,where the anode activation process of bare steel wires is the fastest as is their corresponding corrosion speed,while the anode activation process of oil coated steel wires and their corresponding corrosion speed are the lowest.During the intermediate and late immersion periods, a passive film is generated on the surface of steel wires,which are gradually damaged with the passage of time.Local pitting corrosion occurs easily on the surface of steel wires with a high-polarization potential. Suitable equivalent circuits were chosen to fit the electrochemical impedance spectroscopy（EIS）of steel wires over various corrosive times and different surface treatments,which indicate good fitting results. The double electrical layer charge-transfer resistance increases in the sequence：bare steel wire, untreated steel wire and oil coated steel wire and their corrosion resistance decreases in turn,which is consistent with their polarization curves.The oil layer provides a certain protective effect on untreated steel wires,but its effect is not entirely clear.

CONDITION MONITORING AND FAULT DIAGNOSIS FOR TENSION UNBALANCE OF ROPES IN MULTI-ROPE FRICTION WINDER

This paper analyzes the reasons of the tension unbalance of the ropes in multi-rope fric-tion winder, introduces the method of an on-line monitoring rope tensions with a testing device de-veloped by authors, and proposes the criteria of the fault diagnosis and the method of adjustment for the tension unbalance of the ropes, which is important to the theoretical study on the tension unbalance of the ropes and the maintenance of multi-rope winder.

Movement analysis on steel wire rope of continuous conveyor with disc-tube assembly

The steel wire rope of continuous conveyor with disc-tube assembly is droved by the driving wheel. When the driving wheel rotates, the gear is combined to the con- nection disc in turn, promoting the connection disc to move in succession. Turning the whirling torque of driving wheel into the straight-line traction force. When the steel wire rope is winded by the driving wheel some winded along the circumference, others winded along the straight line. Used motion subject law, this article analyses the change of the velocity and the acceleration of the steel wire rope in the straight movement, and observe the mathematics’ model of velocity and acceleration.

Study of pre-processing model of coal-mine hoist wire-rope fatigue damage signal

In this paper, we propose a pre-processing method for the detection of wire-rope signals. This is necessary because of the lack of processing methods that are currently employed. First, we investigated the one-dimensional discrete morphological and wavelet transform. Then, we developed a pre-processing model that is based on the morphological wavelet-filtering algorithm. We then proposed a modified morphology filtering algorithm. We also designed an experiment platform for wire-rope detection.Eight levels of localized flaws(LFs) and damage were formed in the wire-rope specimen. We performed a series of experimental studies, and the results show that the proposed method can effectively filter the drift signal. The signal-to-noise ratio of the new filtering algorithm was over 26 d B. The signal-to-noise ratio of the existing method is less than 15 d B, and the noise-signal ratio of the new filtering algorithm has improved by 73%. Based on our results, the filtering effect of the proposed method is better than that of the present method. This study has great significance and practical value in engineering applications.