Due to the large size of the bottom surface, the slipper pair of the large displacement piston pump (LDPP) will form a larger linear speed difference in the inner and outer positions of the slipper relative to the center of the swash plate during high-speed rotation. It is more likely to lead to the slipper overturning, which makes the slipper partially worn. To make improvements, the comprehensive performance of the slipper pair of the LDPP, the motion law of the slipper pair of the LDPP was explored. Firstly, a mathematical model of the oil film thickness of the slipper pair of the LDPP under the state of residual compression force is established, based on the consideration of the linear velocity difference formed by the high-speed rotation of the large bottom surface slipper and the theory of dynamics and thermodynamics. Secondly, the impact of rotational speed, piston chamber pressure and oil temperature on the oil film thickness of the slipper pair was simulated and analyzed. Finally, to measure the oil film thickness of the slipper pair, oil film thickness measuring equipment was created, and the accuracy of the mathematical model was verified. The study revealed the changing rules of the oil film thickness and tilt angle of the bottom surface of the slipper pair under various working conditions. The consistency of the simulation and test findings demonstrates that the mathematical model can accurately describe influencing elements and changing rules of the LDPP slipper pair’s oil film lubrication characteristics.

针对隧道掘进机洞内拆装设备多液压缸工作时的同步控制需求,提出了一种基于偏差耦合同步结构的模糊比例-积分-微分(PID)控制策略.首先,根据多液压缸同步举撑电液比例控制系统工作原理,建立了液压举撑系统数学模型,分析了多液压缸不同步问题产生的主要原因;其次,根据液压举撑系统的特点,设计了一种偏差耦合同步控制结构与模糊PID结合的控制策略;最后,通过AMESim和Matlab/Simulink联合仿真试验,对该控制策略的控制性能进行了验证.结果表明:在设备发生偏载的情况下,采用所设计的偏差耦合模糊PID控制策略时,液压缸之间的最大同步误差约为 1.5 mm,能满足 TBM 主机洞内拆装系统的同步控制要求.

Aiming at the problem of low volume efficiency of the plunger type grouting pump,two optimization schemes have been put forward.One is to shorten the movement time of the lifting valve,the other is to improve the hydraulic system.Firstly,The movement process of the valve head of the lifting valve was modeled and analyzed,and the slurry reflux quantity of the plunger type grouting pump was calculated,it was known that the slurry reflux quantity is related to the movement time of the lifting valve and the grouting pressure,the experimental comparison shows that with the shortening of the lifting valve movement time,the reverse slurry volume was reduced and the volumetric efficiency was increased.The principle of existing grouting hydraulic system has been analyzed.Sequential valves are added to the system,the reverse slurry phenomenon has been avoided and the volume efficiency has been improved by controlling the switching sequence of horizontal and vertical lifting valves.

顶推系统作为矩形盾构机的关键系统,承受的负载状况较为恶劣.通过对矩形盾构机顶推液压控制系统和控制策略设计与分析,并对该系统的载荷顺应性进行研究.采用AMESim建模,分析该系统的响应性和载荷顺应性,分析结果表明,顶推系统能够快速实现与负载压力的匹配,系统抗负载变化能力强,位置控制精度高.

Malfunction occurs to the hydraulic system of the cutterhead drive of a shield machine manufactured by Herrenknecht AG during the construction of Shenzhen Metro.It is concluded after analysis that the pollution of the hydraulic oil has resulted in the malfunction.The polluted hydraulic system is treated and the normal operation of the shield machine is recovered.The treatment method for the polluted hydraulic system is presented in the paper.