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液压机>>行业动态
四柱油压机液压缸低速爬行问题解决方法分析
发布者:admin  日期:2016-05-13  点击:1976

四柱油压机是通过泵和油缸及各种液压阀、控制阀、液压缸组成。在四柱液压机运行时,容易产生液压缸低速爬行影响功率的问题,油压机液压缸低速爬行后,有以下几种方法可以解决:

Fourcolumn hydraulic machine is through the pump and cylinder and hydraulic valve,control valve, hydraulic cylinder. In the four column hydraulic machinerunning, easy to produce hydraulic cylinder at a low speed creeping influencepower and hydraulic machine hydraulic cylinder at low velocity crawling, hereare a few ways to solve:

1、液压缸有杆腔和无杆腔存有气体而产生的低速爬行,可通过反复运行液压缸达到排气的目的,必要时在管路或液压缸的两腔设置排气装置,在液压系统工作时进行排气。

1,a hydraulic cylinder with rod cavity and the cavity without a rod being gasgenerated low-speed crawling, by repeatedly running hydraulic cylinder toexhaust the purpose, if necessary in the pipeline or the hydraulic cylinder ofthe two cavity is provided with an exhaust device, hydraulic system working inthe exhaust.

2、液压缸设计间隙不当产生的低速爬行,在前篇我们也讲到了四柱油压机液压冲击影响设备运行怎么办</strong></a>的问题,其中也是因为液压缸间隙设计不当,所以要特别注意这一点。如果产生低速爬行时,可正确设计液压缸内部活塞和缸体、活塞杆和导向套之间的滑动配合间隙,理论上的配合间隙为H9/N或H9/f8,也有H8/f8的;根据本作者的经验,液压缸的缸径和杆径由小到大,如都按此来设计配合间隙,对于较大缸径(200mm)和杆径(140mm)的配合间隙就显得间隙过大,实际应过程中,这类液压缸的低速爬行现象较小缸径的液压缸出现的多,国外此类液压缸滑动面的配合间隙一般设计为0.05mm∽0.15mm,从实际比较的结果来看,液压缸的低速爬行问题明显改善。因此对大缸径的液压缸建议选用这种方法。

2,the hydraulic cylinder design gap caused by improper low velocity crawling, inthe previous article we also talked about the four column hydraulic machinehydraulic impact equipment operation how to do </strong></a>problem, which is because of poor design by the hydraulic cylinder gap, so topay special attention to this point. If the crawl, sliding between the correctdesign of internal hydraulic cylinder piston and cylinder, piston rod and guidesleeve with the gap, the gap with the theory for H9 / N or H9 / F8, there areH8 / F8; according to the author's experience, the hydraulic cylinder bore androd diameter is small such as, according to the design with the gap for largerdiameter (200mm) and the rod diameter (140mm) with the gap is the gap is toolarge, the actual process, this kind of hydraulic cylinder hydraulic cylinderof the low speed creeping phenomenon appears much smaller bore, such foreignhydraulic cylinder sliding surface clearance the general design of 0.05mm to0.15mm, from the actual results, crawl of the hydraulic cylinder was obviouslyimproved. The hydraulic cylinder on the large diameter and suggested the use ofthis method.

3、液压缸内导向元件摩擦力不均匀产生的低速爬行,建议优先采用金属作为导向支撑,如QT500-7、ZQAL9-4等,如采用非金属支撑环,建议选用在油液中尺寸稳定性好的非金属支撑环,特别是热膨胀系数应小,另外对支撑环的厚度,必须严格控制尺寸公差和厚度的均匀性。

3,hydraulic cylinder guide element of friction force is not uniform of slow speedcreeping, suggested priority using metal as a guide support, such as qt500 - 7,ZQAL9 - 4, such as the use of non metal supporting ring, suggested the use ofgood dimensional stability in oil of non metal support ring, especially thermalexpansion coefficient should be small, also on the thickness of the supportring must strictly control the size tolerance and thickness uniformity.

4、对于密封件材质问题引起的液压缸低速爬行,建议在工况允许的条件下,优先采用以聚四氟乙烯作为密封的组合密封圈,如常用的格莱圈、斯特封等等;如选唇口密封,建议材料优选丁晴橡胶或类似材料的密封件,其跟随性较好。

4,the seal material problems caused by the hydraulic cylinder at low velocitycrawling, it is recommended under the conditions permit conditions, givepriority to the adoption with PTFE as sealing combined seal ring, such ascommonly used glyd ring, Lancasterclosure and so on; such as the selection of lip seal, it is recommendedmaterial is preferably Ding Qingxiang gum or similar material seals, thefollowing is better.

5、零部件加工精度的影响问题,在液压缸的制造过程中应严格控制缸体内壁和活塞杆表面加工精度,特别是几何精度,尤其直线度是关键,在国内加工工艺中,活塞杆表面的加工基本上是车后磨削,保证直线度问题不大,但对于缸体内壁的加工,其加工方法很多,有镗削滚压、镗削珩磨、直接珩磨等,但由于国内材料的基础水平较国外有差距,管材坯料直线度差,壁厚不均匀、硬度不均匀等因素,往往直接影响缸体内壁加工后的直线度,因此建议采用镗削滚压、镗削珩磨工艺,如直接珩磨,则必须首先提高管材坯料的直线度。

5,problems affecting the machining precision parts processing, should strictlycontrol the inner wall of the cylinder and the piston rod surface precision inthe manufacturing process of the hydraulic cylinder, especially the geometricaccuracy, especially the linearity is the key, in the domestic processingtechnology, processing the surface of the piston rod is basically the car aftergrinding, ensuring little straightness, but for processing the inner wall ofthe cylinder body, a lot of the processing method, a boring boring rolling,honing, honing directly, but because the basic level of domestic materials thanforeign gap, tube blank straightness, uneven thickness, hardness and otherfactors, often directly affect the inner wall of the cylinder body after theprocessing of straightness. It is proposed to use the boring boring rolling,honing process, such as direct honing, you must first improve the straightnessof the pipe blank.

另外除上述方法外,液压缸的缸体壁厚在允许的情况下,安全系数尽量选大一些,使缸体厚壁增加,特别是高压工况下使用的油缸,以减小油压下的缸体变形,变形后的缸体也会引起液压缸低速爬行。所以在这种情况下,四柱液压机也可以使用以上方法解决此问题。

Also in addition to theabove method, hydraulic cylinder cylinder wall thick under the permission,safety coefficient is chosen as far as possible some of the big, thick cylinderincreased especially high pressure conditions using the cylinder, to reducehydraulic cylinder deformation, deformation of the cylinder will cause ofhydraulic cylinder at low velocity crawling. So in this case, the hydraulic press(www.yxpic.com) can also use the above method to solve this problem.

文章来源:http://yxpic.com/news.asp?lt=273
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