采煤机在采煤过程中，尤其在大倾角、急倾斜工作面工作时，所需制动扭矩大，容易导致制动器发热、磨损。制动摩擦盘在工作中容易产生热变形、热衰退等现象，甚至出现因过热造成的摩擦失效、制动失稳及结构损坏等情况。本论文旨在原有多盘制动器的基础上，结合采煤机的结构及工作特点，通过对多盘制动器结构的改进，利用采煤机冷却系统的水路系统，对制动器摩擦片进行过流式强制水冷，改善其工作性能，克服采煤机制动器失稳现象，提出循环水介质多片盘式制动器，并对制动器展开一系列的设计与分析，研究内容包括以下几方面：

（1）在现有多片盘式制动器的的基础上，通过结构改进，完成过流水冷多片盘式制动器的原理及结构设计。

（2）以MG/750/1910型采煤机为对象，结合采煤机冷却喷雾系统的水路组成，完成过流水冷多片盘式制动器水路系统设计；针对该机型，结合采煤机主要工作参数，对制动器主要性能参数进行了计算，提出了制动器设计要求，完成了整体结构的设计与计算。

（3）对过流水冷盘式制动器的工作性能进行仿真分析和研究。使用有限元分析软件对制动器动、静摩擦片以及制动腔体中的过流冷却流场建立了有限元模型，对制动盘固体变形场和流场进行了数字分析和计算。针对摩擦片表面的接触应力进行仿真分析，获取其表面的接触压力分布。并对湿式多盘制动器腔体内的循环冷却水进行了流场仿真分析，得到了过流水冷多片盘式制动器制动时流场流速及压力的分布特点。利用 ANSYS Workbench软件建立了多片盘式制动器制动过程中的热流固耦合模型，对过流水冷方式下的制动器的制动温升进行了仿真分析。

（4）通过对比试验对过流水冷多片盘式制动器实际制动性能进行分析，分别对过流水冷多片盘式制动器与普通多片盘式制动器进行对比试验，测试制动器的制动性能和散热能力。最终发现过流水冷多片盘式制动器在保证制动性能满足要求的前提下大大提高了散热能力，多次紧急制动试验中水冷制动器与普通制动器相比，制动结束后的温度显著降低，且在持续制动试验中水冷制动器的温升速度缓慢，具有较好的工作稳定性。

本文提出的过流水冷多片盘式制动器具有强散热、制动性能稳定、工作可靠的特点，在采煤机现有工作系统的基础上，对普通制动器不需进行大的结构变化，利用采煤机现有的喷雾冷却系统的水路，通过引入过流水冷的方式，显著改善传统多片摩擦式制动器的工作性能，从而提高了采煤机工作的安全性和可靠性。本文所得结论具有较好的工程应用前景和较高的使用推广价值。

In the working process of shearer, especially in the working face with large dip angle and steep dip angle, the braking torque required is large, which is easy to cause the brake heating and wear. The brake friction disc is easy to produce thermal deformation, thermal decay and other phenomena in the work, and even the friction failure, brake instability and structural damage caused by overheating. In this paper, on the basis of the original multi disc brake, combined with the structure and working characteristics of the shearer, through the improvement of the structure of the multi disc brake, and the hydraulic system of the shearer cooling system is used to carry out the forced water cooling of the brake friction plate, so as to improve its working performance. In order to overcome the instability phenomenon of shearer brake, a multi disc brake with circulating water medium is put forward, and a series of design and analysis of the brake are carried out. The research content includes the following aspects:

(1) On the basis of the existing multi disc brake, through the structural improvement, the principle and structural design of the super water cooling multi disc brake are completed.

(2) Taking the MG/750/1910 shearer as the research object, combined with the water component of the cooling and spraying system of the shearer, the design of the water system for the multi disc brake system with water cooling is completed. According to the main working parameters of the shearer, the main performance parameters of the brake are calculated, the design requirements of the brake are put forward, and the design and calculation of the overall structure are completed.

(3) Simulation analysis and Research on the working performance of the over flow cold disc brake are carried out. The finite element analysis software is used to establish the finite element model of the flow field of the brake's dynamic and static friction plates and the over-current cooling in the brake chamber. The solid deformation field and flow field of the brake disc are analyzed and calculated. The contact stress on the surface of the friction plate is simulated and the contact pressure distribution is obtained.The flow field of the circulating cooling water in the cavity of the wet multi-disc brake is simulated and the distribution characteristics of flow velocity and pressure of the multi-disc brake were obtained. The thermal fluid-structure coupling model of multi-disc brake is established by ANSYS Workbench, and the braking temperature rise of multi-disc brake is simulated and analyzed.

(4) Through the comparative test, the actual braking performance of the super water cooling multi disc brake is analyzed, and the comparative test between the super water cooling multi disc brake and the ordinary multi disc brake is carried out to test the braking performance and heat dissipation capacity of the brake. Finally, it is found that under the premise of ensuring the braking performance to meet the requirements, the heat dissipation capacity of the water-cooled multi disc brake is greatly improved. Compared with the ordinary brake, the temperature of the water-cooled brake is significantly lower after braking in many emergency braking tests, and the temperature rise speed of the water-cooled brake is slow in the continuous braking test, which has good working stability. It can be seen that the over water cooling multi disc brake has the characteristics of strong heat dissipation, stable braking performance and reliable operation. On the basis of the existing working system of the shearer, there is no need to make large structural changes to the common brake, and the existing spray cooling system water system of the shearer is introduced through the way of over water cooling. The working performance of the traditional multi disc friction brake is significantly improved, so as to improve the safety and reliability of the shearer. The conclusion of this paper has good engineering application prospect and high application value.

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