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基于钢球-双锥面增力的偏心驱动压紧装置 总被引:7,自引:0,他引:7
介绍了基于钢球-双锥面增力的偏心驱动压紧装置的工作原理,给出了相应的力学计算公式。给手柄施加一个较小的力,该压紧装置能够获得一个很大的输出力。这就使得在某些场合下,可以用手动压紧装置代替气动压紧装置,甚至液压压紧装置。 相似文献
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介绍了两种新型的以气动肌腱为驱动力,基于曲杠杆-铰杆的压紧装置的工作原理,给出了力学计算公式。与已有的气动肌腱与杠杆-铰杆增力机构的组合装置相比,该压紧装置结构紧凑,增力效果好。 相似文献
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提出一种气动装置以实现在主从式机器手系统中产生力觉临场感。该装置由机械气动结构与PWM控制器两部分组成。详细介绍了力感再现装置力感形成原理与控制方法,搭建了压力修正实验与应力采集实验。实验结果表明,所设计的PWM控制器精确实现了力感驱动气缸的压力控制。该装置用在主从式机器手系统中,能够良好地实现力觉临场感。 相似文献
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余正龙 《机械工人(冷加工)》1993,(9)
在摇臂钻床上钻孔加工,一般借助T形螺栓、压板,用人力把工件压紧在工作台上进行,既费时又费力。为了提高功效,改善劳动条件,我们在钻床工作台上安装了一套气动装置,受到操作者欢迎。 气动压紧工作台的结构如图所示。它由气缸3、螺杆4、拉杆5、压板 相似文献
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HXL2-1.5型电弧炼钢炉用于铸钢件生产多年后,故障增多,尤其是气动控制系统故障频次高,甚至多次发生三相电极夹持不住,造成电极落炉的事故.经拆检发现,气动控制中的气缸内严重生锈,弹簧弹性失效,活塞杆不能复位.而调整压块压紧力不够是导致事故发生的主要原因. 相似文献
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设计了一台在温箱内使用的全性能温度补偿加载机构,考虑到温度交变以及湿度变化的特殊环境,该机构采用了全气动驱动来实现纵向及横向的精确位置加载。机构的纵向和横向由两级气缸和无杆气缸驱动,通过反复测试,设计和优化了气动回路,并根据实际动作要求制定了严谨的电磁阀控制逻辑关系,实现了在温箱内部的安全可靠应用,也为多级气缸及无杆气缸的应用总结了经验。 相似文献
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《Measurement》2014
Servo pneumatic positioning system is a mechatronics approach that enables to use pneumatic cylinders as multi-position actuators. In the present study, an endeavor has been made to simulate the response of pneumatic cylinder parameters. Response surface methodology based analysis have been conducted to evaluate the influences of system parameters such as external load, supply pressure and cross sectional area of cylinder on the response characteristics such as settling time, maximum overshoot, integral time absolute error and maximum force generated using fuzzy rule base models. From the experimental results, it has been inferred that supply pressure has mostly influent nature on determining maximum overshoot and integral of time absolute error (ITAE). It has been observed that cross sectional area and external load has significantly affected the maximum generated force and settling time respectively. 相似文献
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将气缸在行程末端的冲击问题看成一个由细长活塞杆、质量负载、活塞以及端盖组成的振动系统。首先应用弹性体的一维波动方程建立细长活塞杆纵向振动变形的数学模型,用模态叠加方法解析了冲击力、接触位移以及接触时间。然后利用非线性有限元软件LS-DYNA对气缸冲击过程进行数值仿真计算分析,详细研究了当驱动负载质量以及活塞初始冲击速度不同时,活塞冲击接触面接触合力和接触作用时间的变化情况。对比分析了理论解析解与LS-DYNA数值解,验证了解析解的准确性,得出了冲击力分别随速度和负载的变化规律;进一步对冲击振动响应进行了频率分析,并研究了气缸冲击力的变化原因。研究结果为气缸的设计和使用提供了理论和实际参考。 相似文献
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为满足某气体发生系统安装空间小、重量轻、动态响应快、控制精度高等要求,设计了高压气动压力伺服控制系统,并采用高压电-气伺服阀实现了负载压力的高响应高精度控制。建立了系统数学模型,包括高压气瓶热力学方程、高压电-气伺服阀传递函数与流量方程、负载容腔压力变化与排气流量方程等子模型,并设计了反馈线性化PID控制器。基于MATLAB/Simulink平台建立了高压气动系统仿真模型,仿真研究了高压气瓶容积与初始气源压力、负载容腔排气孔通径等参数对系统负载压力控制性能的影响规律。研究结果为该系统的优化设计与实验研究提供重要理论依据。 相似文献
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顺序阀就其控制方式说分为两种:一种是用顺序阀本身进口压力油进行控制的,称为内控顺序阀;另一种是用外部压力油进行控制的,称为外控顺序阀。内-外控顺序阀是结合了内控和外控两种控制方式于一体的一种新型顺序阀。利用这个控制功能,在一个工作循环周期内,该阀可以根据负载情况来控制背压的大小,根据工况的不同来控制背压的有无,即可以避免因负载变化引起的冲击和振动,使液压缸运动平稳,又可以达到节能的效果。 相似文献
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Although the performance and reliability of pneumatic cylinders depend to a great extent on the friction generated at the seals, the friction characteristics have not been widely studied. Both the literature and manufacturers' catalogues rarely discuss the friction characteristics of pneumatic cylinders, and the lack of friction models limits the design, optimisation, and analysis of pneumatic cylinder systems. In seeking to improve the characteristics of pneumatic cylinders and to clarify the friction phenomenon, this paper describes friction force measurement tests carried out in pneumatic cylinders of six different diameters, from 32 to 100 mm. An experimental apparatus was designed to assess the effect of a broad range of operating conditions, where the velocity and pressure of the cylinder chambers are controlled independently. Measurements of friction force are shown for velocities of up to 0.5 m/s and pressures of up to 0.8 MPa. The data obtained will be useful for developing a suitable friction model, and the experimental apparatus will allow study of the effects on the friction force of different types of seal, lubricant, and cylinder barrel. 相似文献
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Pneumatic actuating device with nanopositioning ability utilizing PZT impact force coupled with differential pressure 总被引:3,自引:0,他引:3
This paper reports a new actuating method using piezoelectric (PZT) impact force coupled with differential pressure for the pneumatic positioning device. Fundamental experiments show that the sliding table can be actuated to move with precise step motions in both the forward and backward directions based on the proposed method. A two degree-of-freedom (DOF) analytic model is established and verified for expressing the impact actuation. Furthermore, a pulse width, which is equal to the period of second-mode vibration of the actuating device, is experimentally examined for the actuation of PZT actuator. Finally, position control based on a hybrid controller is implemented. The experimental result shows that the sliding table is successfully positioned from the reference origin to the target position of 4 mm in 0.924 s with the positioning accuracy of 5 μm due to the actuation of the pneumatic cylinder, and that the final positioning accuracy of 10 nm is obtained by the actuation of PZT impact force coupled with differential pressure. The total control time is 2.683 s. It is shown that the proposed method is capable of significantly improving the positioning performance of the pneumatic actuating device. It is expected that the proposed method will be widely applied in the precision industry using pneumatic cylinders. 相似文献
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