PVV5-1X/162RB15UMC REXROTH拉杆气缸与液压缸$横沥镇BOSCH塑料软管

REXROTH拉杆气缸与液压缸$横沥镇BOSCH塑料软管

REXROTH拉杆气缸与液压缸的连接形式，可分为串联型与并联型两种。前面所述为串联型，图42.2-6为并联型气-液阻尼缸。串联型缸体较长；加工与安装时对同轴度要求较高；有时两缸间会产生窜气窜油现象。并联型缸体较短、结构紧凑；气、液缸分置，不会产生窜气窜油现象；因液压缸工作压力可以相当高，液压缸可制成相当小的直径（不必与气缸等直径）；但因气、液两缸安装在不同轴线上，会产生附加力矩，会增加导轨装置磨损，也可能产生“爬行”现象。串联型气-液阻尼缸还有液压缸在前或在后之分，液压缸在后参见图42.2-5，液压缸活塞两端作用面积不等，工作过程中需要储油或补油，油杯较大。如将液压缸放在前面（气缸在后面），则液压缸两端都有活塞杆，两端作用面积相等，除补充泄漏之外就不存在储油、补油问题，油杯可以很小。
REXROTH拉杆气缸对于接近行程末端时速度较高的气缸，不采取必要措施，活塞就会以很大的力（能量）撞击端盖，引起振动和损坏机件。为了使活塞在行程末端运动平稳，不产生冲击现象。在气缸两端加设缓冲装置，一般称为缓冲气缸。缓冲气缸见图42.2-4，主要由活塞杆1、活塞2、缓冲柱塞3、单向阀5、节流阀6、端盖7等组成。其工作原理是：当活塞在压缩空气推动下向右运动时，缸右腔的气体经柱塞孔4及缸盖上的气孔8排出。在活塞运动接近行程末端时，活塞右侧的缓冲柱塞3将柱塞孔4堵死、活塞继续向右运动时，封在气缸右腔内的剩余气体被压缩，缓慢地通过节流阀6及气孔8排出，被压缩的气体所产生的压力能如果与活塞运动所具有的全部能量相平衡，即会取得缓冲效果，使活塞在行程末端运动平稳，不产生冲击。
REXROTH拉杆气缸和油缸组合而成，它的工作原理见图1。它是以压缩空气为能源，并利用油液的不可压缩性和控制油液排量来获得活塞的平稳运动和调节活塞的运动速度。它将油缸和气缸串联成一个整体，两个活塞固定在一根活塞杆上。当气缸右端供气时，气缸克服外负载并带动油缸同时向左运动，此时油缸左腔排油、单向阀关闭。油液只能经节流阀缓慢流人油缸右腔，对整个活塞的运动起阻尼作用。调节节流阀的阀口大小就能达到调节活塞运动速度的目的。当压缩空气经换向阀从气缸左腔进人时，油缸右腔排抽，此时因单向阀开启，活塞能快速返回原来位置。
这种气液阻尼缸的结构一般是将双活塞杆缸作为油缸。因为这样可使油缸两腔的排油量相等，此时油箱内的油液只用来补充因油缸泄漏而减少的油量，一般用油杯就行了。

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REXROTH拉杆气缸与液压缸$横沥镇BOSCH塑料软管

REXROTH拉杆气缸与液压缸串联而成，两活塞固定在同一活塞杆上。液压缸不用泵供油，只要充满油即可，其进出口间装有液压单向阀、节流阀及补油杯。当气缸右端供气时，气缸克服载荷带动液压缸活塞向左运动（气缸左端排气），此时液压缸左端排油，单向阀关闭，油只能通过节流阀流入液压缸右腔及油杯内，这时若将节流阀阀口开大，则液压缸左腔排油通畅，两活塞运动速度就快，反之，若将节流阀阀口关小，液压缸左腔排油受阻，两活塞运动速度会减慢。这样，调节节流阀开口大小，就能控制活塞的运动速度。可以看出，气液阻尼缸的输出力应是气缸中压缩空气产生的力（推力或拉力）与液压缸中油的阻尼力之差。
REXROTH拉杆气缸的结构而言，尚可分为多种形式：节流阀、单向阀单独设置或装于缸盖上；单向阀装在活塞上（如挡板式单向阀）；缸壁上开孔、开沟槽、缸内滑柱式、机械浮动联结式、行程阀控制快速趋近式等。活塞上有挡板式单向阀的气-液阻尼缸见图42.2-7。活塞上带有挡板式单向阀，活塞向右运动时，挡板离开活塞，单向阀打开，液压缸右腔的油通过活塞上的孔（即挡板单向阀孔）流至左腔，实现快退，用活塞上孔的多少和大小来控制快退时的速度。活塞向左运动时，挡板挡住活塞上的孔，单向阀关闭，液压缸左腔的油经节流阀流至右腔（经缸外管路）。调节节流阀的开度即可调节活塞慢进的速度。其结构较为简单，制造加工较方便。
 

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