In the article is made an analysis of failures in the hydropneumatic parts of complex technical objects. Grounded is the choice of the method the method for compiling information on failures from the documentation of the repair services of producer and consumer. There have been identified types of failure that occurred. Has analyzed the physics of operational failure. Conclusions are made for improving the reliability in exploitation of the entities.
Mechanization in agriculture & Conserving of the resources
Vol. 60 (2014), Issue 1
Table of Contents
Направен е анализ на състоянието на тракторния парк в страната, условията за поддържането му в работоспособно състояние и нормативната база за оценка на риска в ремонтнообслужващите дейности, Предложен е методически подход за оценка на риска при техническо обслужване и ремонт на трактори, отчитащ многообразието от форми и дейности извършвани при този вид работи.
STUDY OF THE WORKING SECTION PERFORMANCE FOR LAY DOWN OF BIODEGRADABLE BAND INTO THE SOIL WITH INTEGRATED SEEDSpg(s) 11-12
The article analyzes the work of the section laying biodegradable tape embedded in it seeds and studied overshoot depth of laying the tape depending on the forward speed of the machine unit and different depths of sowing method of measuring the depth and statistical methods for processing data obtained from the experiments.
TECHNICAL AND ECONOMICAL INDICES OF OPERATIONS FOR MECHANIZED SESAME GROWING AND HARVESTING WITH GRAIN HARVESTERpg(s) 13-15
They are investigated the main technical and economical indices of mechanized operations for sesame growing and harvesting with grain harvester. The ABC (Activity Based Costing) approach is applied for calculating all production expenses. It is determined that the application of mentioned technology is profitable when the area exceeds 53 hectars, the average yield is above 980 kg/ha and harvest losses are below 52 %. The harvest composes 9,94 % from total expenses, but the share of losses of this operation determines the economic efficiency of the whole mechanized production of sesame.
Sieves as mechanical separators are primarily means of separating the grain size mixtures which are subject to cleaning or sorting. Commonly used sieves with flat working surface and oscillated movement. Regardless of their design, however, the separation process has a probabilistic nature and on the length of the separating bodies are most accurately describes the exponential dependence.
Separation capability, respectively quality performance of the mechanical separators are characterized respectively by the coefficient of separation 𝜇𝜇 and completeness (effect) of splitting (𝜀). Each of these features may depend on many factors, but it was found that the most х strongly influenced by the length of the separator ‘s body. In its essence, the coefficient 𝜇𝜇 expresses the probability of screening a single х grain particle moves through in a length unit.
The change in the coefficient of separation with separators having equal work areas do not necessarily lead to a change in the quality of their work. This can be explained by the fact that, under equal operating conditions the change of the length does not change their surface area, and this means a constant specified load and accordingly the same effect on the separation. From this standpoint, the coefficient of separation and the effect of separation can be justified based on the design parameters of the separator, which determine the working area.
The focus of this paper is the need to achieve energy efficient work regimes in the operation of actual pump systems, because of the impact which energy efficiency has on the utilization of electricity by a system. Some of the main factors influencing the efficiency of a system’s crucial elements also have been examined. A quick and easy method for a quantitative assessment of a pump system’s efficiency also has been presented. The reliability of this methodology has been tested and confirmed. In conclusion, a method for the theoretical determining of the effective work regimes for a centrifugal pump with a trimmed impeller has been given.
Търговията със селскостопански машини в Полша по правило не се основава на принципа на изключителността. Голяма част от дилърите предлагат различни марки селскостопански машини, нови и употребявани. Водещите дилъри получават машините на принципа на дългосрочен договор с производителя, основаващ се на търговски кредит, по-рядко на комисионен принцип. В търговията на дребно се разви продажбата на кредит. По-конкретно, представителите на западните концерни, продаващи големи и скъпи машини, предлагат специални кредити за земеделците в сътрудничество със западните банки. Активността на местните производители в сферата на кредитната помощ за земеделеца остава далеч назад спрямо чуждестранната конкуренция.