HXD气流干燥过程工艺气流传热分析

为研究RCC-HXD气流干燥过程的运行规律,在热工原理分析的基础上,设定试验方案并进行数据采集处理,通过使用在线数据采集系统RSSQL并运用理论推导和统计分析方法对试验结果进行了分析。结果表明:①在干燥过程中,HXD喂料点前工艺气流与烟丝间的换热量可用干燥前后工艺气流温差的倒数来衡量;②在其它控制参数不变,只改变排潮模式(手动与自动)的情况下,设置为手动控制排潮时,干燥过程的换热量总是较低;③当设置为自动排潮且HXD蒸气注入量超过1800kg/h时,工艺气流的干燥能力随着注入量的增大而降低。     

403型气动比例积分调节器故障分析

分析了403型气动比例积分调节器的结构和工作原理,并介绍了其常见故障及排除方法。认为应根据现场需要,正确选择403的作用方式,并且合理调节比例与积分参数,才能使调节器处于理想的工作状态。     

气动肌腱驱动的基于增力铰杆-恒增力杠杆的压紧装置设计

介绍一种气动肌腱驱动的基于增力铰杆-恒增力杠杆的压紧装置,分析其工作原理,并给出相应的力学计算公式。利用气动肌腱输出力/直径比大、输出力/质量比大的突出优点,该装置能够显著地对输入力进行放大,增力效果明显,没有污染,是一种绿色的压紧装置。     

气动圆砂工作原理及其自身特性研究

介绍了气动马达在气动工具中的应用,阐述气动圆砂的工作原理,对其功能进行优化,实现气动圆砂的自吸尘功能同时降低了使用中的噪音,分析并解决气动圆砂在实际使用中振动和偏摆问题,提高产品的耐用度,延长使用寿命。     

苯胺装置紧急停车系统(ESD)的设计探讨

从安全生产角度出发,提出在苯胺装置设置独立的紧急停车系统(ESD)。作为安全保护系统,其权限优先于生产过程控制,实时在线监测装置的安全性。首先阐述了采用ESD的背景,然后对现有苯胺装置的生产状况和自控水平进行了介绍,提出采用ESD的必要性,最后从ESD系统设计选型、ESD功能及特点、切断阀的选用以及ESD联锁设计中需要注意的几方面详细介绍了苯胺装置紧急停车系统的设计选型与应用。     

Synchronization controller for a 3-R planar parallel pneumatic artificial muscle (PAM) robot using modified ANFIS algorithm

Parallel manipulator is a closed-kinematic chain mechanism in which performance of its end effector – moving platform is contributed by its independent actuators. In traditional designs, each elemental actuator has its own controller as well as reference input, and it works independently without gathering information from its neighbors. Consequently, as one of the actuators cannot keep up with the others, the platform performance is easily deteriorated due to the lack of coherence between these actuators. Therefore, the aim of this paper is to design a 3-R planar parallel robot and develop a proper synchronization controller for its tracking control task. Adaptive Network Based Fuzzy Inference System (ANFIS) algorithm was modified and applied as the main strategy of this synchronization controller. The controller is then able to compensate errors between the actuators and enforce them to cooperate harmonically with each other regardless external disturbances caused by the outside environment or geometrical constraints of the closed-loop structure. Simulations and practical experiments on a scaled parallel robot were carried out to evaluate the designed controller. The results showed that by applying the proposed control technique, the working errors of the component actuators converged quickly to zero almost at the same time. As a result, the tracking performance of the common platform was significantly improved in comparison with the performance when applying a non-synchronization controller. The proposed method is effective in controlling systems which require collaborations between the sub-agents.     

基于气动和PLC控制技术的模具标准件分装机械手自动线研发

介绍了针对模具标准件分装工作而设计的分装机械手自动线,着重介绍分装工艺流程、自动线设计方案、外围硬件设计和PLC控制系统程序的开发.经过企业实际应用,该自动线运行稳定可靠,实现了生产自动化,为企业创造了价值.     

Control design of a pneumatic cylinder with distributed model of pipelines

In this paper, the control design with distributed model of pipelines is proposed to make the cylinder side be free of pressure sensors. In this research, long connected pipelines are used. The pipeline is designed as a one dimensional distributed model. The model of pipelines is based on the discretization of four equations, as state equation of air, motion equation, continuity equation, and energy equation. The distributed model estimates the pressure losses and time delay through long connected pipelines in real time. To confirm the control method with distributed model of pipelines, a simulation model of the whole system is designed. Compared simulation and experimental results, it has been found that the model represents the real system well. In the experiments, the pressure values in the cylinder chambers estimated by the distributed model in real time played as control signals. Compared with the estimated and measured pressure values in the cylinder chambers, it is found that with this distributed model, the pressure values in the cylinder chambers is precisely estimated in real time using the measured values at the control ports of the servo valve. The experimental results demonstrate that the position accuracy is almost the same with that of using the measured pressure signals in the cylinder chambers. The cylinder side is free of pressure sensors with the proposed control method.     

气动位置伺服系统状态反馈控制的改进

基于一种能反映气动位置伺服系统特性的线性化数学模型,对压力差反馈的控制性能进行了理论分析,由分析结果可知,压力差反馈虽然能够该善系统的动态性能,但会引起较大的稳态偏差。在此基础上,提出以压力差微分反馈代替压力差反馈,采用位置、速度和压力差微分反馈控制来改善系统的控制性能,理论分析了该方法的有效性。为了抑制气动位置伺服系统存在的期望值附近的位移波动现象,提高系统的控制精度,提出压力差辅助控制方法。将所提出的控制方法应用于摆动气缸位置伺服系统,试验结果表明,系统获得了较好的控制性能。     

粉煤灰气力输送喷射器的设计及应用

喷射器是一种特殊的流体机械,具有结构简单、易加工、工作可靠、无旋转部件、无泄漏等特点。文中将喷射器用于电厂粉煤灰气力输送上,给出了喷射器的设计方法。