[摘要]乌鲁木齐挖机出租挖掘机斗杆缸的修复详解。一台大宇生产的DH320挖掘机在施工中突然斗杆缸发出异响，开始时认为此声响是活塞断裂或活塞上密封圈损坏，活塞被液压油推动的撞击声，或活塞刮缸筒内壁的声音。
挖掘机斗杆缸的修复详解。一台大宇生产的DH320挖掘机在施工中突然斗杆缸发出异响，开始时认为此声响是活塞断裂或活塞上密封圈损坏，活塞被液压油推动的撞击声，或活塞刮缸筒内壁的声音。于是，初步断定该液压缸已基本不能使用，但新购一根斗杆缸最快需15天，而且还将影响3-4台T815自卸汽车的出工，在万不得已的情况下拆开缸盖，拔出活塞杆后发现：活塞并未断裂、活塞上的油封也未损坏，而活塞上的锁紧螺母却已被撞坏，卡在缸筒底部；锁紧螺母的锁紧卡环与活塞杆连接的那部分环被剪断留在活塞杆上；自由式筒的有效部分未发现有刮伤的部位。于是，用起重机将缸筒吊起，试图将撞坏的螺母抖出来，但因螺母卡得太紧而未能凑效。其他办法怕伤及缸筒体和端盖间应留有定位部分，所以决定车削掉焊接部分，将端盖与缸筒体分开。在测量了缸筒体长度和油孔的位置后，车去焊接部分，端盖与缸筒体顺利地被分开了（见附图）。加长臂挖掘机出租
DH320 a Daewoo excavator production in construction suddenly bucket rod cylinder issued abnormal sound, at the beginning that this sound is the sealing ring on the piston piston fractured or damaged, the piston is banging the hydraulic oil to drive, sound inner wall of cylinder or piston scraping. Then, concludes that the hydraulic cylinder has been basically can not be used, but the new share a bucket rod cylinder needs at least 15 days, but will also affect the working 3-4 T815 dump truck, in the case of last resort opened the cylinder head, pull out the piston rod was found: the piston does not break, the piston oil seal is is not damaged, and the lock nut on the piston has been damaged and the card in the cylinder bottom; a locking nut locking snap ring and the piston rod is connected with the part of the ring was cut in the piston rod; the effective part of the free type tube was not found to have scratch part. Then, lifting hoist cylinder, trying to shake out the damaged nuts, but because the nut tight control and unsuccessful. The other way is afraid of hurting the cylinder body and the end cover should be left between the positioning part, so decided to turning off the welding part, the end cover is separated with the cylinder body. In the cylinder body length and the oil hole measuring position, car to the welding parts, the end cover and the cylinder body is smoothly separated (see the figure).
取出废螺母后，用油后磨掉其印痕（虽然印痕不能全磨干净，但活塞伸不到该位置，不影响正常使用），然后将端盖和缸筒体按原来的位置找正后焊接好，经保温和探伤检验合格后，即可装机使用。
Remove waste nut, oil mill off the mark after (although not all wear clean impression, but the pistons stretched to the location, does not affect the normal use), and then the end cover and the cylinder body according to the original position after welding is looking good, qualified by insulation and flaw detection, can be installed to use.
同时，为避免同样事故的再次发生，将螺母的锁紧装置用M10螺栓代替原来直径为5mm的卡环。原液压缸活塞的锁紧螺母为圆形螺母，锁母上为通孔，活塞杆上为盲孔，锁止卡环将螺母卡住，防止其退出。修理时，新加工的锁紧螺母为六角螺母，将螺母拧紧后在活塞杆上连同锁紧螺母钻一直径为10.5mm的通孔，在装定位置螺栓的螺母时涂上螺栓紧固剂，以防止其退出。活塞杆上锁紧螺母部位的定位螺栓（原为卡环）主要承受锁紧螺母的剪切力，原锁止卡环主要是因抗剪强度小而被剪断，8.8级M10螺栓的抗剪强度为原锁止卡环的2倍，使用该螺栓后可有效地防止其被剪断。液压缸内的主要受力零件为活塞，活塞通过连接螺纹（或轴肩）将力传给活塞杆，活塞杆上新钻的通孔不在连接螺纹的受力部位，不会影响活塞杆的强度和刚度，因而不影响其使用。
At the same time, in order to avoid similar accident happening again, the nut lock using M10 bolt and replace the original diameter of the snap ring 5mm. Liquid pressure cylinder piston lock nut is a round nut, lock nut is a through hole on the piston rod is a blind hole, the locking clasp nut will be stuck, prevent its exit. Repair, new processing lock nut six hexagon nut, the nut on the piston rod with locking nut diameter drill a hole 10.5mm, the nut setting position bolts painted bolt fastening agent, to prevent its exit. A positioning bolt piston rod locking nut site (formerly clasp) mainly bear the shear force of the locking nut, the original lock clasp is mainly cut and was due to small shear strength, anti lock 2 times as the original card ring shear strength of M10 bolts of grade 8.8, the use of the bolt can be effectively to prevent it being cut. The hydraulic cylinder of the main force components for the piston, the piston through the connecting thread (or shoulder) will force to the piston rod, piston rod through hole drilling is not in force part connecting thread, will not affect the strength of the piston rod and stiffness, so does not affect the use.
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