煤矿钢丝绳芯输送带作为煤矿开采的主要运输设备，在长期高负荷运行状态下，由于输送带接头处的钢丝绳芯通常容易发生抽动，使皮带接头发生断裂，导致严重的经济损失。漏磁检测以其独特的优势在钢丝绳芯输送带缺陷无损检测中被广泛应用，但其对输送带接头的检测仍然存在许多不足。因此，研究煤矿钢丝绳芯输送带接头漏磁分布规律，并对接头抽动进行定量评价，对于煤矿钢丝绳芯输送带接头抽动漏磁定量检测具有重要的理论意义和应用价值。 首先，针对输送带接头漏磁场分布规律研究难题，分析了煤矿钢丝绳芯输送带接头的结构、接头抽动断带过程及接头漏磁无损检测的原理，建立了合理的接头漏磁磁偶极子模型，对一阶接头的漏磁场分布以及影响其漏磁分布的因素进行了理论分析，得到了一阶接头漏磁理论分布特点及其随接头结构参数、相关检测参数变化的规律。 其次，针对钢丝绳芯输送带设备庞大笨重，内部接头结构参数无法控制的缺点，设计了接头三维漏磁分布自动检测系统以对接头漏磁分布进行实验探究。该系统包括接头漏磁检测系统和三轴运动控制系统。接头漏磁检测系统采用高精度的Hall传感器和数字化高精度CH-3600高斯计，对接头漏磁场进行高精度测量。三轴运动控制系统采用了多轴运动控制器SMC6480，对传感器探头在扫描时的定位和移动进行精确控制。使用Labwindows\CVI软件对上位控制软件进行了开发，实现了对接头漏磁信息空间域采集的自动化，为接头漏磁分布的实验研究提供良好的前提条件。 第三，针对接头漏磁理论分析与实际接头漏磁之间可能存在的差异，制作了实验接头，并对实验过程中的探头、接头位置及各坐标方向进行了规定，使实验结果直观可信。通过对一阶接头漏磁分布进行检测实验测试，验证了接头漏磁理论分析中的结论，并对复杂的多阶接头进行实验测试，获得了多阶接头的漏磁分布规律。 最后，针对输送带漏磁检测接头抽动的定量评价问题，根据理论分析与实验测试中接头漏磁分布规律，设计了接头漏磁峰值间距特征提取方法，对实验接头漏磁分量Bz的信号峰值间距进行了有效的提取。依据接头长度与漏磁信号峰值间距之间的对应关系，制订了接头抽动漏磁定量评价方法。通过对实验接头的抽动进行漏磁定量评价，将接头抽动的漏磁定量评价结果与直接测量的接头抽动距离进行比较，得到了接头抽动漏磁定量评价误差的分布范围，验证了该接头抽动漏磁定量评价方法的有效性以及本研究的正确性。

The coal mine steel wire core conveyor belt is used as the main transportation equipment for coal mining. Under long-term high-load operation conditions, the steel wire rope at the joint of the conveyor belt is usually prone to twitch, causing the belt joint to break and causing serious economic losses. Magnetic flux leakage detection is widely used in the non-destructive testing of steel cord conveyor belts for its unique advantages, but there are still many deficiencies in the detection of conveyor belt joints. Therefore, studying the law of the distribution of magnetic flux leakage in joints of steel cord conveyor belts and quantitatively evaluating joint twitching has important theoretical significance and application value for the quantitative detection of magnetic flux leakage in coal mine steel cord conveyor belts. Firstly, in order to solve the research problem of the distribution law of leakage magnetic field in conveyor joints, the structure of the joint of the wire rope core of the coal mine, the process of joint breaking and the nondestructive testing principle of the joint magnetic leakage were analyzed, a reasonable magnetic flux leakage magnetic dipole model was established. The theoretical analysis of the distribution of the leakage magnetic field of the first-order joint and its influence on the factors has been conducted. The theoretical distribution characteristics of the first-order joint leakage magnetic flux and its variation with joint structural parameters and related detection parameters have been obtained. Secondly, aiming at the huge bulkiness of the steel cord conveyor belt equipment and the inability of the internal joint structural parameters to be controlled, an automatic three-dimensional magnetic flux distribution detection system was designed to explore the leakage flux distribution of joints. The system includes a joint flux leakage detection system and a three-axis motion control system. The joint flux leakage detection system uses a high-precision Hall sensor and a digital high-accuracy CH-3600 Gauss meter to measure the leakage magnetic field of the joint with high accuracy. The three-axis motion control system uses the multi-axis motion controller SMC6480 to precisely control the positioning and movement of the sensor probe during scanning. Labwindows\CVI software was used to develop the superordinate control software. The automation of space domain acquisition of joint leakage information was realized, which provided a good precondition for the experimental study of joint leakage flux distribution. Thirdly, according to the possible difference between the theoretical analysis of joint leakage and the magnetic flux leakage of the actual joints, experimental joints were made, and the positions of the probes, joints and coordinate directions during the experiment were specified, so that the experimental results were intuitive and reliable. By testing the leakage distribution of the first-order joints, the conclusions in the theoretical analysis of joint leakage are verified, and the complex multi-stage joints are tested experimentally to obtain the leakage magnetic distribution of multi-stage joints. Finally, in order to solve the quantitative evaluation problem of the magnetic flux leakage detection joint twitching of the conveyor belt, according to theoretical analysis and experimental test leakage magnetic distribution of the joints, a joint leakage magnetic peak spacing feature extraction method was designed, and the effective feature extraction of the peak distance between the magnetic flux leakage component Bz of the experimental joint is carried out. According to the correspondence between the length of the joint and the peak spacing of the magnetic flux leakage signal, a quantitative method for the magnetic flux leakage of the joint twitching was developed. Through the quantitative evaluation of the magnetic flux leakage of the experimental joint, the results are compared with the direct measuring distance of the joint twitching. The error distribution range of the quantitative evaluation of the magnetic flux leakage of the joint twitching is obtained. The validity of this method for the quantitative assessment of magnetic flux leakage in the joint and the correctness of this study were verified.