共查询到20条相似文献,搜索用时 62 毫秒
1.
文登市泽库镇西泊村一台刚修过的195型柴油机又出现了启动困难的故障。而且发动机启动着火后冒黑烟,转速低,气门顶杆弯曲,气门间隙短时间变大,发动机无法正常工作。经检查是气门导管安装 相似文献
2.
3.
江西省吉水县水南镇一农民购买了一台 1 60F型柴油机 ,在经销处试机时 ,很好启动 ,回到家里后 ,就发动不起来了。一台新柴油机怎么会启动不了呢 ?经农机修理人员拆开检查 ,发现气门摇臂支座上的紧固螺母松动 ,使气门摇臂不能定时将气门打开和关闭 ,配气时间错乱 ,导致柴油机启动不了。后来 ,按规定力矩拧紧气门摇臂支座上的紧固螺母 ,发动机就可正常启动了新柴油机启动不了的原因@刘开顺 相似文献
4.
1一辆配装S195型柴油机的唐牛7Y—750型三轮农用运输车 ,启动后 ,发动机怠速运转了2min后 ,温度升高就自动熄了火 ;机手再次启动 ,再次出现上述现象。机手在摇车启动时 ,开始总有一段时间 ,气缸无压缩力 ,待一会儿才能将发动机启动着。经分析 ,故障原因可能是气门导管与气门杆的间隙不当。当发动机启动后 ,随温度逐渐升高 ,气门导管与气门杆受热膨胀 ,其间隙随之变小 ,将气门杆紧紧夹在导管中 ,气门无法关闭 ,发动机因无压缩力而熄火。过一段时间后 ,发动机温度渐渐降下来 ,气门导管和气门杆遇冷收缩 ,又出现了间隙 ,气门杆又… 相似文献
5.
6.
柴油机的气门推杆是一根又细又长的杆件,两端一般呈半球形,气门推杆是柴油机挺柱与气门摇臂之间的唯一的传动零件。 在实际使用中,如果发生气门推杆脱落,安装不到位,气门摇臂将失去驱动力,气门不能按时打开,造成发动机功率不足,甚至不能启动,或者空气滤清器发出“吼吼”的哮喘声音、冒浓烟等不正常现象。如果气门推杆因种种原因弯曲,会造成气门间隙忽大忽小,破坏发动机的正常工作。 相似文献
7.
配气机构是发动机主要机构之一,它的技术状态好坏,直接影响发动机的动力性与经济性。(1)一台杂195型柴油机维修后,启动发动机听到有强烈敲击声。检查气门间隙、配气定时齿轮记号都正常。当拆下缸盖时,发现活塞顶部有气门顶撞的印痕,详细查看是排气门凸出缸盖平面 相似文献
8.
一台刚更换了新活塞环的195型柴油机,冷车较易启动,而热车则启动困难。据机手讲,该机冷车时压缩还可以,但热车时则压缩不良,且发动机功率不足。根据上述故障特征,初步诊断为气门间隙过小而造成的。因为气门间隙过小,随着发动机温度的升高,气门及传动件受热膨胀,致使气门关闭不严而漏气,但检查结果并非如此。 相似文献
9.
一、气门关闭不严
1.故障现象不减压摇转曲轴可听到漏气声。气门关闭不严可导致发动机压缩不良,柴油机冒黑烟,功率下降,从而使动力性、经济性下降,启动困难并有可能烧损气门。 相似文献
10.
11.
12.
13.
14.
15.
《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
16.
17.
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
18.
19.
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
20.
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