Dynamic analysis of indentation rolling resistance of steel cord rubber conveyor belt

To study the variation trend of the indentation rolling resistance of a rubber conveyor belt under different environmental temperatures, the sinusoidal compression displacement test was first carried out on the rubber matrix at six temperatures between -20 °C and 40 °C by a high and low temperature universal testing machine. Elastic modulus E₁, E₂ and loss factor tan θ of the rubber matrix were identified using the Fourier series. Then, the dynamic contact characteristics between the idling roller and conveyor belt were analyzed by the viscoelastic mechanics theory. Hence, the calculation equation of the indentation rolling resistance in the full thickness direction of the conveyor belt was deduced. Finally, a practical calculation and experimental verification of the indentation rolling resistance of the steel cord rubber conveyor belt at different temperatures were conducted. The results showed that the drop of the indentation rolling resistance of the conveyor belt was significant when the temperature was increased in the range of -20–10 °C. In the range of 10–40 °C, the influence of the increase of the ambient temperature on the indentation rolling resistance was relatively weak. Additionally, it is found that the contact force in the vertical direction and the idling roller diameter are important factors that affect the indentation rolling resistance of the conveyor belt. The influence of belt speed on the indentation rolling resistance is weak.     

深槽带式输送机的设计

通过深槽带式输送机与其他大倾角带式输送机的性能对比,论述了采用四辊双排中心对称深槽角托辊组实现物料大倾角输送的特点;通过合理布置托辊组,确保设备正常运行,并实现节能降耗的目标.     

Influence of tension and release in piped conveyor belt on change of normal contact forces in hexagonal idler housing for pipe conveyor loaded with material

Every kind of transported bulk material influences operational characteristics of the pipe conveyors significantly. Therefore it is necessary so that users of the pipe belt conveyors are able to perform a more detailed investigation and monitoring of these characteristics. Thanks to information concerning the operational characteristics it is possible to analyse durability of the conveyor belt and extent of belt wearing. However, the process of data collection and identification is demanding and expensive on condition that such process would be realised only by means of measuring equipment. Much more effective is obtaining of the needed information using generalized knowledge in the form of graphs. Every operator of the pipe belt conveyor is able to obtain the required information based on known input values using the corresponding graphs. Afterwards, the obtained information can be applied in a real operation. This article deals with determination of the contact force values for a certain type of the conveyor belt. The contact forces can be estimated in the intersection of axis at the individual idler roll positions in dependence on the tension force and in dependence on the filling rate of the cross-sectional area of the piped belt with the material, taking into consideration the performed experimental measurements.     

带式输送机的研究进展

在信息技术时代，某些关键性的技术使带式输送机生产产生了飞跃，包括运行阻力计算方法、标准、动力学分析、高张力输送带设计、接头分析、输送机试验台的发展及缓冲、清扫和监控技术。带式输送机已经在长距离输送机、转弯输送机、高强度倾斜输送带、高速输送机、管状输送机、双向输送机、垂直提升输送机和气垫带式输送机等方面取得了新的发展。     

调心托辊和带式输送机参数对纠偏力的影响

对调心托辊进行了受力分析，得出了纠偏力的理论计算公式，并分析了调心托辊和带式输送机的参数对纠偏力的影响，为带式输送机的设计与安装提供了理论依据。     

带式输送机断电过程的动力学仿真

通过有限元法建立了整个带式输送机系统纵向振动的动力学模型，应用Matlab Simulink软件建立了带式输送机动力学系统的仿真模型，通过合理的设置仿真参数，对带式输送机的断电过程进行仿真，对其结果进行可视化处理，以控制输送机断电情况下的稳定性和安全性。     

Analysis of asymmetrical effect of tension forces in conveyor belt on the idler roll contact forces in the idler housing

This paper analyses an impact of asymmetrical tension forces, which are occurring in the conveyor belt, on the contact forces in the guiding idlers. It describes causes of an increased wear-out of the conveyor belts due to an asymmetric tensioning of the transport belt. There were investigated five measuring points loaded with a symmetrical and asymmetrical tensioning of a specimen section of the pipe conveyor transport belt, using the Friedman test for the factor of asymmetry. The tension force determines also changes of the contact force layouts in the individually investigated idler rolls. A newly developed method was applied in order to identify states of the particular experimental phases for the process of the transport belt tensioning and relaxation. This method is based on differences of the contact force time behaviours. It is possible to present a hypothesis, taking into consideration the obtained results that a side slipping of the running conveyor belt is caused by the tension force asymmetry also on the real operational conditions.     

带式输送机输送带跑偏时的速度分析

输送带跑偏的危害极大,不仅降低其使用寿命,严重时还会引起整机损坏及人员伤亡等恶性事故的发生。本文采用理论分析和数值模拟的方法对输送带跑偏时的速度进行了分析研究,得到了输送带横向运动速度与调心托辊前偏置角、托辊旋转速度及输送带速度之间的关系,为带式输送机的纠偏防偏提供了理论指导。     

负载特性对输送带动态特性的影响

针对带式输送机传统的静态设计方法，不能满足大运量、长距离和高带速输送机的使用要求。通过分析在输送机启动过程中，不同负载对输送带动态特性的影响，为带式输送机的动态设计提供理论依据。利用AMESim建模软件，建立了带式输送机启动过程的动力学模型，并对带式输送机在空载、变负载和满载工况下对输送带动态特性的影响进行了仿真。结果表明，在输送机启动过程中，负载特性影响输送带动张力大小、应力波传播的速度以及持续的时间。     

Modelling rolling contact phenomena in a pouch belt conveyor system

This paper presents a simplified approach to modelling the rolling contact phenomena that occur at the surface of a wheel driven rubber belt. The main aim of this approach is to determine the rolling friction due to hysteresis and the relationship between traction and slip in wheel driven belt conveyors. The resulting model is an expansion of an existing linear viscoelastic model consisting of a three parameter Maxwell model combined with a Winkler foundation that is used to determine the rolling friction due to hysteresis in a conventional conveyor with a flat belt. Adaptations are introduced to incorporate a curved belt surface and to analyse the relationship between traction and slip. Attention is also paid to matching the model parameters to the viscoelastic properties of an actual rubber sample and subsequently the usefulness of more complex Maxwell models regarding rolling friction and traction is investigated.     

带式输送机平面转弯的结构设计

阐述了平面转弯带式输送机设计所采取的三个主要措施,包括基本措施、附加措施和应急措施,并根据带式输送机的自然变向转弯的力学条件对曲线段胶带进行了受力分析计算,介绍了转弯段托辊结构的设计。研究结果表明:带式输送机设计要符合转弯结构条件、力学平衡条件和最大转弯半径条件,并根据实际情况改进了托辊的结构形式。     

特种带式输送机与创新设计

从特种带式输送机开发目的角度将其分为大倾角与垂直提升、降低输送带张力、降低输送机运行阻力（改变输送带支撑方式）、密闭输送物料、空间转弯等5类,讨论了各种特种带式输送机的特点;从创新设计方面分析了特种带式输送机的发展。     

Mathematical models for indirect measurement of contact forces in hexagonal idler housing of pipe conveyor

This article presents creation and verification of linear regression models intended for prediction of the pipe conveyor belt contact forces on the idler rolls in the hexagonal idler housing. This problem is solved for using the method of indirect measurement, which enables to specify other required parameters with certain desired calculation accuracy on the basis of one monitored parameter. There is defined an initial hypothesis, which consists in assumption that it is possible to determine the contact forces in all other guide idler rolls according to detection of the contact force in one guide idler roll. The obtained models are corresponding with real operational conditions. The main advantage of these models consists in a fact that they have been created according to the real experimental measurement. The results presented in this paper are useful for the real practice because they enable to arrange such position of the guide idler rolls in the hexagonal idler housing, which is easy accessible not only with regard to the mounting of it, but also taking into the consideration safety, as well as which is suitable for installation and service of the measuring equipment.     

带式输送机凸弧段托辊间距的计算

对带式输送机凸弧段托辊间距的合理布置开展分析研究与计算,在带式输送机托辊间距布置满足辊子承载能力和输送带的下垂度的要求的基础上,针对凸弧段托辊受力的特殊性,通过对其受力分析、力学计算,合理布置凸弧段托辊间距,从而避免托辊间距过大托辊易损,托辊间距过密造成浪费。     

矿用带式输送机承载托辊的磁性液体润滑与密封性能

托辊密封不可靠会引发轴承润滑失效,进而导致托辊旋转阻力急剧增加直至完全卡阻,已成为煤矿井下带式输送机的主要故障原因之一,提高托辊密封与润滑性能对于提升带式输送机工作效率具有重要现实意义。基于纳米磁性液体密封与润滑理论设计了新型托辊样机,利用可模拟井下环境的托辊旋转阻力试验台在不同试验条件下与普通托辊进行了性能对比试验。结果表明,常规环境定载荷试验中,磁性液体密封润滑托辊的旋转阻力较普通托辊最大降低45%,平均降低17%;常规环境定带速试验中,磁性液体密封润滑托辊的旋转阻力较普通托辊最大降低73%,平均降低54%;模拟井下煤尘环境试验中,磁性液体密封润滑托辊的旋转阻力较普通托辊平均降低26%;煤泥水淋水24 h试验后,普通托辊的旋转阻力增大至原来的7倍,而磁性液体密封润滑托辊的旋转阻力基本无变化。采用磁性液体密封润滑的托辊在不同试验条件下具有低旋转阻力、高抗水淋性等优异性能,可为井下带式输送机向低能耗、高可靠、长寿命方向发展提供有力技术支撑。     

逆止托辊在上运带式输送机中的应用

介绍了新研制开发的带式输送机逆止托辊的基本工作原理、构成及其主要部件设计,该逆止托辊为上运带式输送机的应用提供了进一步的安全保障.     

平面转弯带式输送机结构参数计算方法

在讨论平面转弯带式输送机设计要点的基础上,将输送物料截面上表面假设成圆弧形状,导出了物料在各个托辊上的载荷分配系数的计算式;分析了平面转弯带式输送机的转弯力平衡、应力应变和输送带不离开托辊的限制条件,建立了转弯段输送带张力所引起的向心力和导向力的平衡方程,用此方程可以在给定平面转弯带式输送机转弯段结构参数情况下计算输送带的偏移量,用以判断结构参数设计的合理性,构成平面转弯带式输送机的一种结构参数设计方法.应用此方法确定了某水泥公司的石灰石输送线平面转弯带式输送机托辊组的结构参数.     

圆管带式输送机运行阻力虚拟仿真试验研究

建立了圆管带式输送机动态阻力虚拟仿真试验模型,对成管状后的胶带运行阻力及输送机工作时托辊组中接触压力的分布进行了试验研究,考察了物料、预张紧力、管带速度、弯道形式与拐弯半径等对管带运行阻力的影响,获得运行时托辊组中托辊压力分布状态。试验过程状态与实际相符,其结果对圆管带式输送机设计制造有指导意义。     

变频调速在煤矿井下钢绳牵引带式输送机上的应用

分析比较了在用的钢绳牵引带式输送机调速驱动机构的结构组成、工作原理、性能，介绍了防爆变频调速装置在煤矿井下钢绳牵引带式输送机上的使用情况、优点等。