3DREP6C-21=25EG24N9K4/M=00,德国力士乐REXROTH比例阀,原装产品,价格优惠,现货库存,上海韦米机电设备有限公司供应;
液压比例控制系统
以比例控制元件完成动力与运动方向控制,分为比例压力阀、比例流量阀、比例方向阀及比例方向流量阀,可为模拟量输入或数字量输入,视是否带反馈分为开环控制与闭环控制,一般获得频率不是很高(10HZ)以内,高频响阀可实现较高频率。
若精度要求不高可考虑使用电液比例控制系统,一般电液比例控制系统可达至以下精度
位置精度- 3 mm
速度精度带压力补偿器- 3%
加减速斜坡时间-0.5秒
压力带位移传感器的产品-比例压力阀设定的0.3% (如压力设定为200bar,精度可达0.6bar)
一般的多驱动器液压系统皆要求流量及压力控制,提供比例压力及流量控制系统
开环式比例压力及流量控制可用于定量泵及变量泵系统。
速度和流量比例控制的分别是:
流量控制只控制供油量,并不控制驱动元件的运动方向;
若系统负载及变速要求高,则要使用速度控制系统。
速度比例控制多用于自动化控制、注塑机、压力机等
使用闭环的主要原因:
保持设定值不受外来干扰所影响
→在不同的工作压力下保持稳定的速度
→在不同的输出力下保证相同位置
→在带偏载的情况下作同步移动
提高精度要求
→位置误差低于1 mm
→压力误差低于1 ba
→需要控制加减速度
高动态要求的系统
→模拟应用
→测验应用
液压系统的组成及其作用
一个完整的液压系统由五个部分组成,即动力元件、执行元件、控制元件、辅助元件(附件)和液压油。
动力元件的作用是将原动机的机械能转换成液体的压力能,指液压系统中的油泵,它向整个液压系统提供动力。液压泵的结构形式一般有齿轮泵、叶片泵和柱塞泵。
执行元件(如液压缸和液压马达)的作用是将液体的压力能转换为机械能,驱动负载作直线往复运动或回转运动。
控制元件(即各种液压阀)在液压系统中控制和调节液体的压力、流量和方向。根据控制功能的不同,液压阀可分为村力控制阀、流量控制阀和方向控制阀。压力控制阀又分为益流阀(安全阀)、减压阀、顺序阀、压力继电器等;流量控制阀包括节流阀、调整阀、分流集流阀等;方向控制阀包括单向阀、液控单向阀、梭阀、换向阀等。根据控制方式不同,液压阀可分为开关式控制阀、定值控制阀和比例控制阀。
辅助元件包括油箱、滤油器、油管及管接头、密封圈、快换接头、高压球阀、胶管总成、测压接头、压力表、油位油温计等。
液压油是液压系统中传递能量的工作介质,有各种矿物油、乳化液和合成型液压油等几大类。
液压系统结构
液压系统由信号控制和液压动力两部分组成,信号控制部分用于驱动液压动力部分中的控制阀动作。
液压动力部分采用回路图方式表示,以表明不同功能元件之间的相互关系。液压源含有液压泵、电动机和液压辅助元件;液压控制部分含有各种控制阀,其用于控制工作油液的流量、压力和方向;执行部分含有液压缸或液压马达,其可按实际要求来选择。
组合机床动力滑台液压系统
动力滑台是组合机床的一种通用部件,在滑台上可以配置各种工艺用途的切削头。机床液压动力滑台可以实现多种不同的工作循环,其中一种比较典型的工作循环是:快进→ 一工进→二工进→死挡铁停留→快退→停止。 使液压缸差动联接以实现快速运动; 系统中采用限压式变量叶片泵供油; 用行程阀、液控顺序阀实现快进与工进的转换; 电液换向阀 使液压缸差动联接和变量泵以实现快速运动;
(1)快进 按下启动按钮,三位五通电液动换向阀5的先导电磁换向阀1YA得电,使之阀芯右移,左位进入工作状态。 用二位二通电磁换向阀实现一工进和二工进之间的速度换接。
(2)一次工作在快进行程结束,滑台上的挡铁压下行程阀。 用行程阀、液控顺序阀实现快进与工进的转换; 用二位二通电磁换向阀实现一工进和二工进之间的速度换接。
(3)第二次工作进给 为保证进给的尺寸精度,采用了死挡铁停留来限位。
(4)死挡铁停留 当动力滑台第二次工作进给终了碰上死挡铁后,液压缸停止不动,系统的压力进一步升高,达到压力继电器15的调定值时,经过时间继电器的延时,再发出电信号,使滑台退回。在时间继电器延时动作前,滑台停留在死挡块限定的位置上。
(5)快退 时间继电器发出电信号后,电液换向阀右位工作。 这时系统的压力较低,变量泵2输出流量大,动力滑台快速退回。由于活塞杆的面积大约为活塞的一半,所以动力滑台快进、快退的速度大致相等。
(6)原位停止 当动力滑台退回到原始位置时,挡块压下行程开关,电液换向阀处于中位,动力滑台停止运动,变量泵卸荷。
3DREP6C-21=25EG24N9K4/M=00
力士乐REXROTH比例减压阀
力士乐REXROTH比例减压阀,直接操作
力士乐REXROTH三通结构的比例减压阀,直动式3DREP(E) 6
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目前钢筋切断机的主要有两种形式,一种是机械式切断机, 一种是液压式切断
机,机械式切断机主要利用凸轮的运动来切断钢筋,液压式切断机主要利用液压系统为机器提供动力进行工作。 这两种切断机相比较而言,液压式切断机优势较为明显,性能稳定 、噪音小,这些优势给液压切断机的广泛应用创造力有利条件。 就目前的发展趋势来看,液压切断机克服了过去的一些缺点,剪姆率、速度、误差等性能有了大幅提高。本设计对切断机的液压系统泵站进行了设计,系统采用电磁换向阀、叠加式减压阀 压力传感器等措施,使该液压系统运行平稳、能耗小、安全可靠性高。
由于液压技术有很多优点,从一般传动到精密控制,都得到了广泛的应用。在机械工业中,目前机床传动系统有85%采用液压传动与控制,如磨、铣、刨、拉、及组合车床等;在工程机械中,普遍采用了液压传动,如挖掘机、轮胎装载机、汽车起动机、履带推土机,自行式铲运机、平地机、压路机等;在农业机械中,目前已用于联合收割机、拖拉机、工具悬挂系统;在汽车工业中,液压制动、液压自卸、消防云梯等都得到广泛应用;在冶金工业中,如电炉控制系统、轧钢机的控制系统、手炉装料、转炉控制,高炉控制等;在轻纺工业中,诸如注塑机、橡胶硫化机、造纸机、印刷机、纺织机械等;在船舶工业中,如全液压挖泥船、打捞船、采油平台、翼船、气垫船及船舶辅机等。一切工程领域,凡是有机械设备的场合,均可采用液压技术,使用领域和设备越来越宽、越来越多