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1转向沉重主要原因是没有供给转向器足够的压力油或是机械故障,具体有:(1)吸油不充分。油箱油液不足、油液黏度太大、吸油滤清器堵塞都可导致油泵吸不上油,从而不能给系统供给压力油。检查油箱液面高度,添加足够的液压油;更换合适的油液;清洗或更换滤芯。(2)油泵故障。油泵磨损过度,内漏过大,容积效率下降,在系统工作时,油泵供油量小于转向器公称流量,使系统压力建立不起来。检查油泵工作情况,修理或更换油泵。(3)未装人力转向单向阀,或是杂物垫起单向阀钢珠使钢珠与阀座密封不严;或是单向阀钢珠掉入阀套与阀体环槽之间,这些都可导致动力转… 相似文献
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液压悬挂系统不能正常提升农具。操纵手柄扳至提升位置后,农具不能提升;有时提升缓慢,而且有抖动现象;提升过程中产生噪声,有时出现发热现象。检查方法:操纵机构失灵,可用手感法判断。如果提升时油泵伴有噪声和发热现象,可能是吸不上油或吸油不足。如油箱内产生大量气泡,则表明油泵吸油管路有漏气之处。 相似文献
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《农业机械化与电气化》1995,(1)
东方红-75拖拉机液压系统常见的主要故障有哪些?答:1.农具提升缓慢(严重时不能提升) 故障原因有:(1)从吸油道吸入空气(伴随有提升颤抖,油箱内起泡,甚至夹带机油从加油口冒出,油泵有噪音和泵壳过热现象。)①油泵进油管接头接触不严或油泵油封损坏。②油面过低、温度过低、机油过粘(规定冬 相似文献
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一、整机不出油 由于电气故障致使电动机不能启动,应检查开关、线路及电器元件有无损坏。传动装置失灵,皮带过松导致失速或吸油管连接不严密漏入空气,应及时检修吸油管接头和调整、更换皮带。油罐内单向阀密封不严或泵内零件严重磨损致使油泵泄漏过大, 相似文献
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《农业机械化与电气化》1995,(2)
[55]东风-55拖拉机液压系统常见的主要故障有哪些? 答:主要故障有: 1.提升缓慢严重时不能提升 原因:(1)从吸油道吸入空气。伴随有提升抖动,油泵噪音和泵壳过热的现象。 ①油量过少,油温过低,油的粘度过大。(规定冬 相似文献
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一、CB型齿轮泵1.油泵吸压油口不能装错,必须大口接油箱,小口接分配器。如果安装错误,将因吸油不足而吸进空气,导致液压径向力不平衡,加剧元件磨损。2.轴套不能互换,否则会加剧端面磨损。3.卸荷片及隔压圈要装在吸油腔一侧前轴套的端面上,装错将会导致轴向“液压补偿”得不到平 相似文献
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1.液压系统机构分析法(1)分部法。上海—50型拖拉机液压悬挂系统可分为四大部分:液压油泵与吸油滤网;控制阀;液压油缸;力调节与位调节机构。分部是便于机手分析时逐步缩小范围,能迅速准确地判断出产生故障的部位。(2)分段法。从吸油滤网到控制阀为第1段,从控制阀到液压油泵为第 相似文献
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(1)转向沉重 ①吸油不充分。油箱油液不足、油液勤 度太大、吸油滤清器堵塞都可导致油泵吸 不上油。检查油箱液面高度,添加足够的液 压油厘换合适的油液;清洗或更换滤芯。 ②油泵故障。油泵过度磨损,内漏过 大。检查油泵工作情况,修理或更换油泵。 ③未装人力转向单向阀;杂物垫起单 向阀钢珠使钢珠与阀座密封不严;单向阀 钢珠掉入阀套与阀体环槽之间,这些都可 导致动力转向时单向阀关闭不严,进出油 口连通。检查单向阀安装情况;检查油液是 否清洁。清洗转向器;检查单向阀钢珠与阀 座密封情况不严时可通过研磨修复,然后 换装新… 相似文献
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1.把油泵的吸油口(大口)对着安装者,从输入端看主动齿轮的旋向。若主动齿轮顺时针旋转,油泵则为右旋泵;若主动齿轮逆时针旋转,油泵则为左旋泵。 2.左旋泵主动齿轮安装在右方,右旋泵主动齿轮安装在左方。 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献