# 2006 * XVII * 2

CONTENTS

 https://agrt.emu.ee/pdf/contents/2006_2_sisukord.pdf

SCIENTIFIC WORK
M. Heinloo,T. Leola.
Multiparametric of synthesis the manipulator of the scraper of the press manure removal 88

 This paper presents the results of solving the following problem of multiparametric synthesis: determining 4 parameters of the manipulator of the scraper of press manure removal and finding out their values as the manipulator takes the prescribed positions and has equal angular velocities at the beginning and end of its turning. The solution to this multiparametric synthesis problem is based on the methods of the Machine and Mechanism Theory. The results of this paper can be useful for the designers of manipulators for press manure removals. Keywords: agriculture, machinery, manure, technology, simulation, computer graphics, Mathcad, synthesis, manipulator, pressurer. https://agrt.emu.ee/pdf/2006_2_heinlooik.pdf

J. Olt, L. Käis.
Kinematics of the working unit of the blueberry harvester 101

 The height of the plant of lowbush blueberry is in the range 10–60 cm and berries ripen more or less at the same time (Starast et al., 2005). It is appropriate to harvest blueberries with machines. The functional working unit of the machine is a picking-reel and the working elements are four picking rakes. A picking rake consists of rake teeth fixed on a rotating shaft. In this case we study the rough blueberry harvester. The task of the blueberry harvester is to pick berries undamaged and to transport them into a container. The harvester is without a sorting line and because of that the berries and additives are not separated. The apparatus parameters of the picking reel are: reel radius r, reel height H, number of rakes z, teeth length of the picking rake lp and angle of inclination γ. Keywords: blueberry harvester, picking reel, picking rake, rake teeth, kinematics parameter. https://agrt.emu.ee/pdf/2006_2_oltik.pdf

V. Palge, M. Pennar.
The determination of strawberry plant temperature in spring frost conditions 110

 Measuring the surface temperature of the strawberry flower in spring frost conditions gives new information that helps to explain the damages caused by spring frost. The traditional way of measuring spring frost temperatures does not reflect the actual nature of the process. This paper presents data recorded during spring frost. We have measured air temperature in the traditional way of recording spring frost temperatures. We have also recorded the temperature of the strawberry flower – the part of the plant that is damaged by spring frost. Measurements were made at night in the spring of 2006. Measurements were made with IR thermometer UT-02S, temperature sensor TMCx-HA and data logger HOBO U12-006. The data was retrieved by the programme Greenline. 5 K to 9 K lower temperatures were observed on the surface of the flower and the air temperature sensor. –4.5 °C was the lowest temperature of flower surface that was recorded. Keywords: strawberry, plant, spring, frost, temperature, measuring. https://agrt.emu.ee/pdf/2006_2_palgeik.pdf

J. Priekulis, V. Zujs, U. Iljins.
Ensuring of milking equipment washing liquid operation temperature 113

 The article presents mathematical substantiation of heat leak from the washing liquid circulating in the milking equipment. In addition, the possibilities of reducing this leak have been investigated by covering the milk and washing liquid pipes with heat insulation material. It has been stated that in a barn where milking equipment for milking 100 cows in milk pipe is installed, the washing liquid loses approximately 60% of heat flowing through the milk and washing liquid pipes. If the milk and washing liquid pipes are covered with heat insulation material the heat leak through these units will only be in the amount of 26% calculating from the total leak. Methods and appropriate software have been developed for determination of the final temperature of the milking equipment washing liquid. Keywords: milking equipment, washing liquid, heat leak, ensuring of liquid temperature, heat insulation, mathematical substantiation. https://agrt.emu.ee/pdf/2006_2_priekulis.pdf

B. Reppo, E. Mikson.
Relation between the indoor and outdoor climate in uninsulated cowsheds 126

 In Estonia, there are about fifty farms with uninsulated and loose housing cowsheds where the outdoor climate has big impact on the indoor climate of the cowsheds. It is known that cows can put up with lower temperatures much better than with higher ones, so we can say that these buildings are well suited for animals, although there are problems with workers and working environment in uninsulated cowsheds in extreme cases, during very low and high outside temperatures. The goal of this study was to find out the outdoor climate impact on indoor climate in cowsheds with 500, 420 and 250 cow places during winter and summertime. For that, indoor temperature, relative humidity and ammonia content were measured, using measuring device ALMEMO Data Logger 2690-8 with respective sensors and computer programme AMR WinControl. At the same time, outdoor temperature and relative humidity were measured, using measuring device HygroLog with sensor HygroClip S. The data about empiric dependence of indoor temperature, relative humidity and ammonia content upon outdoor climate are given. The processed results are well applicable when designing new cattle housing or improving the indoor climate of already existing uninsulated cowsheds. Keywords: uninsulated cowshed with cubicles, outdoor climate, indoor climate, air temperature, relative humidity, ammonia content, Data Logger, computer programme. https://agrt.emu.ee/pdf/2006_2_reppoik.pdf

T. Sõõro.
Traffic safety of a slow vehicle 139

K. Tamul, J. Olt.
The programming peculiarities of benches in contemporary agricultural mechanical engineering business 150

 Businesses producing and repairing agricultural technology still largely use NC-led benches – mostly lathes. Benches with technically outdated NC control system are still being used for the simple and CNC-led benches for handling the complicated surface geometry. Such a work division provides a more economic usage of the CNC-led bench resource. Programming NC-led benches is far more complicated when compared to that of CNC-led benches – even for handling the simplest surface geometry (phases, cones), a blueprint needs to be compiled with the CAD programme. According to the change in the measurements of the detail, a new blueprint needs to be compiled each time. Compiling the blueprint could be renounced when a mathematical model would be compiled for the corresponding surface element – it would help to find the coordinates of certain points required for programming. The present article describes the mathematical model for calculating the coordinates necessary for programming phases and cones with different measurements. The model has been compiled on the basis of MS Excel, as this programme (or analogues) are used in most of the mechanical engineering businesses. Keywords: cutting treatment, phase, cone, main measurements of the instrument, insert nose radius, mathematical model. https://agrt.emu.ee/pdf/2006_2_tamulik.pdf

I. Tomson, V. Viljasoo, N. Bajeva, A. Bajeva.
Factors influencing the indoor climate of a cowshed and the reliability of indoor climate parameters of a milking parlour 165

 During various technological processes, inevitable changes in the chemical content and electrical characteristics of air occur. Thus, it is essential to research the influence of materials used in production and proceeding sideproducts upon micro-, para- and electroclimate in a cowshed. This article studies data regarding the provided norms of indoorclimate parameters, the indices of reliability of specific parameters and their subordinance to distribution laws. Keywords: indoor climate, microclimate, electroclimate, paraclimate, environment, technological processes, materials, reliability https://agrt.emu.ee/pdf/2006_2_tomsinik.pdf

Ü. Traat, M. Padar, K. Kaljuvee.
The maintenance of tractors and the developments in Estonia in 2006 187

 The problems connected to the maintenance of tractors in agricultural enterprises have not been studied in recent years. In this article an overview of what is the current situation with the diagnostics of tractors, repairs and maintenance works in reality is given. How they are actually organized, what are the future prospects and expenses in this field and how satisfied the workers are with the situation. As a separate part are discussed at the characteristics of the western tractors, their expenses connected to repair works and maintenance. The fuel consumption of Valmet, John Deere and New Holland tractors is compared. All the statistics are also compared to those of the Russian tractors. Keywords: tractor, repairs, maintenance, diagnostics, maintenance costs. https://agrt.emu.ee/pdf/2006_2_traatik.pdf