A regression model for prediction of pipe conveyor belt contact forces on idler rolls

The paper presents design and verification of regression models for prediction of pipe conveyor belt contact forces on idler rolls. Their advantage is in the fact that they have been created according to the real experimental measurement. The obtained models correspond with real operational conditions. The concept of the experimental rig at the Technical University of Košice is designed so that it represents 8 m long section of pipe conveyor. The conveyor belt is an object with action of tension force and at the same time it takes the initiative in the contact force formation. Several criteria have been used to verify the presented regression models. The tensioning force 9000, 12,000 and 15,000 N have MPE of prediction error less than 5%. About 120,000 measured values have been processed during the evaluations which correspond to approximately 15,000 results from experimental measurements.     

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.     

带式输送机前倾托辊的探讨

指出带式输送机输送带跑偏的原因,探讨了前倾托辊的纠偏原理,通过算例分析了前倾角度对纠偏效果的影响,定性给出了前倾角度与纠偏力的关系,提出纠正输送带跑偏的建议。     

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。     

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.     

全永磁驱动带式输送机控制策略及动力学行为

针对传统异步电机驱动和液压绞车张紧带式输送机存在的传动效率低、运行维护困难、张紧响应慢等问题,设计了一种集永磁电机直驱与永磁张紧于一体的全永磁驱动带式输送机,制定了全永磁驱动系统矢量控制策略与机-电耦合动力学模型;利用Matlab/Simulink建模仿真与煤矿井下现场试验相结合的方法,研究了全永磁驱动带式输送机在空载启动、满载启动、变载运行等工况下的矢量控制策略与机-电耦合动力学行为。结果表明：全永磁驱动带式输送机在多种工况下均能实现转矩与转速的快速响应和动态调节,具有良好的动态特性;多台电机间可维持功率平衡与同步传动,具有较强的抗干扰能力;永磁张紧装置可以实现张紧力动态调节,有利于提高带式输送机驱动效率、张紧响应速度以及整机协调可控性;全永磁驱动系统可实现对带式输送机的智能驱动与动态张紧,在机-电耦合动力学行为仿真试验与现场试验中得到的电机动态特性规律基本一致,表明其可满足煤矿井下带式输送机实际工况需求,具有较高的推广应用价值。     

张紧方式对带式输送机启动特性的影响

带式输送机启动过程中，存在输送机动态特性明显、输送带承载段张力峰值波动大、张紧装置提供的张紧力不能保持稳定等问题。利用AMESim软件对不同的张紧方式进行建模，分析了不同张紧方式在“S”形正弦启动方式下，对张紧装置提供的张紧力以及输送带最大张力点的张力峰值波动的影响。仿真结果表明，张紧装置对张紧力的稳定性影响着输送带承载段的张力峰值波动大小，且成正相关性，仿真结果便于使用者根据不同的场合和条件使用不同的张紧方式。     

燃煤火力发电厂皮带液压张紧系统故障分析

为了解决带式输送机自动液压张紧系统工作的不稳定性问题,首先通过对火力发电厂在用的皮带张紧系统工作过程进行分析,明确了液压张紧系统的工作原理和优势,探讨了电—液联合控制在皮带张紧应用上的本质联系;然后解析了液压张紧系统的缺点,根据实际出现的不同故障,提出了具体故障检测和处理方法;最后对液压自动张紧系统提出了综合改进对策。实践结果表明,所提出的故障处理方法和改进对策能够有效提高带式输送机运行的安全可靠性。     

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。     

橡胶带接头疲劳强度测试实验台的研究

阐述了输送机橡胶带的接头疲劳强度测试方法,介绍了实验台的实验机理和控制方式,将输送带的安全性能设为最高等级,以此为参考确定了接头疲劳性能和寿命测试实验条件,计算了输送带的张力及破断力,根据系统张力、功率以及辊子运行速度,对电机和减速器进行选型。     

Online monitoring of a pipe conveyor. Part I: Measurement and analysis of selected operational parameters

The need to maximize the performance and operational reliability of ecological continuous conveyor systems is increasing nowadays and their requirements are difficult to fulfil. One of the main reasons to this is the complexity of ecological continuous conveyor systems. Regular tracking and monitoring of systems selected parameters and indicators support their proper functioning and operational reliability. However, the process becomes useless if the parameters are not tracked and evaluated. The paper shall present the results of research aimed at determination of evaluation criteria for selected parameters. The research was carried out by a method of experimental measurement on an experimental rig the construction of which is similar to the construction of real pipe conveyors used in practice. Some of the convenient parameters to be tracked on a tube conveyor are a tension force and contact forces on hexagonal idler housing. The paper aims to track the course of contact forces and their mutual relations with intensity of tension forces. In order to create a comprehensive evaluation and analysis of the research, the experimental measurements were carried out for two cases, with and without material. The experimental tests are evaluated with the use of basic mathematical and statistics methods.     

带式输送机托辊的设计

在分析轴承、密封结构以及润滑方式对托辊性能的影响的基础上，使用逐点计算法计算最大托辊间距，综合考虑影响因素，最后确定托辊间距。并结合实例进行分析和说明。     

驱动带式输送机的直线电动机次级的设计

为解决带式输送机在远距离、大运量输送过程中其输送带张力太大的缺点,选用直线感应电动机直接驱动带式输送机,同时对驱动带式输送机的直线电机次级的材料、结构和布置进行了详细的对比分析,从而进行选型。     

自动张紧装置在可伸缩带式输送机中的应用

介绍了变频调速自动张紧装置的组成、工作原理和优点。对某国有大型煤矿在用带式输送机配置了变频调速自动张紧装置和传统的重锤张紧装置,并对二者进行了对比研究,得出如下结论：同一带式输送机,采用自动变频张紧装置时,其张紧小车速度是重锤张紧装置移动速度的0.35倍,张紧小车位移是重锤张紧装置的0.36倍;自动变频张紧装置可为带式输送机提供合适的张紧力。     

T型带式输送机驱动力计算方法

由于驱动方式不同，T型带式输送机的设计计算方法与传统带式输送机的有很大不同。从理论上推导出了单个驱动点上的驱动力计算方法，为T型带式输送机的设计提供理论依据。     

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.     

输送带跑偏的原因及其防偏措施的分析

详细分析了槽状带式输送机的输送带在运行中产生跑偏的原因,对几种常用的处理输送带跑偏的措施进行了分析,并对采用各种措施后的效果作了比较。     

皮带机重锤拉紧装置的计算方法

简要介绍了皮带机重锤拉紧装置的布置形式,通过分析皮带机重锤拉紧装置的组成结构,提出了重锤重量的计算方法,该计算方法简单明了,易于掌握,为皮带机重锤拉紧装置的设计提供了有效的参考方法.