针对国内部分箕斗提升系统不能实现定重装载的问题，本课题采用液压式的称重方法和PLC控制技术，研制了一套矿用立井箕斗定重装载系统。文中对定重装载液压系统进行了动态性能研究，分析了管路参数对液压系统动态特性和称重精度的影响，阐述了PLC及模拟量输入模块的选型与I/O点数的分配，建立了PLC控制的硬件接线图及相应的软件控制流程，最后，对定重装载系统进行了实验研究，研究结果表明该系统能有效提高箕斗提升的自动化程度和生产安全性。本课题的主要研究内容如下： (1)以铜川矿务局王石凹煤矿为例，分析现场条件，根据实际工况，对定重装载系统进行了设计，得出了液压系统原理图、PLC的接线图、控制流程图和MCGS软件监测界面。基于PLC的控制系统采用“一用一备”冗余设计方法，具有可靠性高、操作简单等特点，基于MCGS组态软件的上位机具有工作状态监测、故障诊断和报表打印等功能。 (2)对于定重装载液压系统，管路不仅作为传动和控制中连接个元件的桥梁，而且作为油液的容腔，对称重的精度有着重要影响，因此，分析管路动态特性对课题的研究至关重要。本课题建立了管路的集中参数数学模型和仿真模型，分析了管路的分段数对流量和压力特性的影响，得出1m长管路采用2段模型就可以达到良好仿真精度的结论。 (3)管路与定重装载液压系统的关系是本课题的研究重点。为获取系统的动态特性，本课题建立了考虑管路影响的液压系统数学模型与仿真模型，并对带长管路液压系统的动态特性进行了仿真研究。通过对系统响应性能指标的分析，得出了管路的材料、长度和内径等参数对液压系统影响的规律，为以后设计类似的系统提供了理论依据。 (4)本课题以王石凹煤矿所使用的定重装载系统为实验模型，进行了实验室实验研究和现场实验研究，实验内容包括液压系统的启动及运行、受冲击、实验室模拟装载过程和生产现场装载等，并从试验的角度得到了一些实测数据。通过分析，这些数据基本与理论分析结果相一致，表明该立井箕斗定重装载系统可应用于矿山生产现场。

For the problem of partly old main shaft’s skip hoist systems cannot achieve weight-fixed loading, this paper adopted hydraulic-weighing method and programmable logic controller, designed the main shaft's skip weight-fixed loading system. The paper researched the dynamic characteristic of hydraulic system, analyzed the impact of weighing accuracy and dynamic characteristics of the hydraulic system on the pipeline parameters, expounded the selection on the PLC and analog input module, and the distribution on I/O points, established the diagram of the PLC and controlled flow chart. And last, the main shaft's skip weight-fixed loading system is studied experimentally. The results showed the main shaft’s skip weight-fixed loading system can increase the degree of automation loading and safety production. The main contents of the research are as follows: (1)The design of weight-fixed loading system focus on Wangshiwa coal mine, in accordance with the site and actual conditions, the paper obtained the principle chart of weight-fixed loading hydraulic system, drew the diagram of the PLC, control flow chart and MCGS-based monitoring interface. The PLC-based control system used the method of "one-up" redundancy design, with high reliability, operated easily and other features, the MCGS-based monitor computer system has the functions of working condition monitoring, fault diagnosis, statements printing and so on. (2)For the weight-fixed loading hydraulic system, the pipeline not only as a bridge of connecting transmission and controlled devices, but also as oil capacity cavity, it has a major impact on the weighing accuracy, therefore, the study of dynamic characteristics on pipeline is essential. The paper established lumped parameter model and the simulation model, analyzed the characteristic of flow rate and pressure on the pipeline’s section number, which obtained the conclusion that every one-meter long pipeline divided into two sections can be achieved fine effect on the accuracy of the simulation. (3)The paper focus on the relationship between the pipeline and weight-fixed loading hydraulic system, for access to the dynamic characteristics of the hydraulic system, the paper established the mathematic and simulation model, researched the dynamic characteristics of hydraulic system with long pipeline. Through analyzing on the performance criteria of system response, the results were compared with the pipeline material, length and other diameters of the hydraulic system, provided a theoretical basis for the future design of similar system. (4)Based on the weight-fixed loading of Wangshiwa coal mine, the laboratory and field experiments were carried out, including the start-up and operation of hydraulic system, the impact of loading process simulation of laboratory and production site loading, as well as produce the measured data from the pilot's perspective. The experimental results validated the above theoretical analysis, proved the feasibility of monitoring and control system, and the accuracy of theory and simulation analysis.