Development of the design and justification of the parameters of the guide rapier of the weaving machine

The article describes the design feature and the principle of operation of the recommended pattern of the weaving rapier guide. On the basis of theoretical studies, graphical dependencies of the parameters of the guide roller were adjusted, the system parameters were recommended by analyzes.

CONTACT PROBLEM OF INTERACTION OF A GUIDE ROLLER WITH A MINE CONDUCTOR

The article considers the force interaction contact problem of a guide roller with a mine conductor during the movement of a mine lifting conveyance on the example of a model problem of the contact interaction of a torus with a beam. The model problem analytical solution is considered, a finite element model of the system under study is developed. Contacting bodies materials elastoplastic behavior was taken into account when solving the problem. The various contact types between guiding roller and the conductors were considered. The values of critical loads leading to plastic deformations occurrence in a conductor with various types of contacts are determined and their relationship with the friction coefficient value is established. Comparative analysis of the obtained analytical and numerical results demonstrates a high degree of correlation.

Design Requirements Substantiation for an Automated Planting Unit for Potato Minitubers

The authors showed that the transition to the technology of virus-free minitubers mass production changed the machines requirements for planting original seed potatoes.(Research purpose) To develop a technological scheme and substantiate the design parameters of the planting apparatus of an automatic planter of potato minitubers.(Materials and methods) The development was based on an elevator-type planting apparatus. The authors decided to create a spoon design with the ability to grip and move into the guide casing one minituber in each spoon, eliminating the minitubers jumping from one spoon to another or pinching them when moving along the guiding casing to the furrow bottom. The diameters of the lower guide and upper drive rollers were theoretically substantiated in order to exclude the influence of the planting tubers sizes difference on the uniformity of their submitting into the furrow.(Results and discussion) The authors determined the minimum permissible elevator belt speed, which depended on the distance between the spoons on the elevator belt and the planting unit speed. The size of the upper driving reel diameter was justified from the condition that the spoon unfolded 180 degrees in at least 1.5 seconds, which ensured a tuber smooth transition to the back side of the spoon.(Conclusions) The authors developed a technological scheme of an automatic planting elevator type device for planting potato minitubers with a working speed of 6-9 kilometers per hour. It was found that the upper driving reel diameter was not less than 44 centimeters, and the lower guide roller diameter was not more than 12 centimeters. They showed that the double-sided design of scooping spoons with the possibility of installing replaceable bowls in them would ensure a high-quality planting of not only minitubers, but also subsequent reproductions of seed and ware potatoes with a tuber mass of 5-80 grams.

V-belt transmissions of agricultural machines

The article is devoted to the analysis of design features and operating conditions of V-belt trans-missions of agricultural machinery. When designing these gears, it is recommended to give prefer-ence to gears made according to an open circuit or with a tension roller located outside the belt con-tour, to avoid cross and semi-cross gears, as well as multi-pulley gears with crossing shaft axles. To make the wider use of more progressive types of belts. It was shown that the features of V-belt transmissions of agricultural machinery require clarification of the methods for calculating trans-missions with progressive types of V-belts and automatic belt tensioning methods. It was noted that special attention should be paid to transmissions with multi-profile belts, which calculation has not been sufficiently reflected in domestic regulatory documents. The advantages of such belts are es-pecially noticeable under variable and shock loading. Based on the analysis, the recommendations for clarifying the calculation of belt drives with multi-profile belts were given. Analytical dependencies are proposed for determining the value of the nominal power transmitted by one belt (stream) of a multi-profile belt, allowing automation of the calculation of V-belt transmissions of agricultural machinery. For gears with a tension or guide roller that add an extra (sometimes reverse) bend of the belt, it is proposed to determine the coeffi-cient taking into account different degrees of bending on the pulleys according to a graph built tak-ing into account the linear hypothesis of summation of damages. It is recommended to calculate gears with spring-loaded tensioning rollers and design tensioning devices for such transmissions using a special method that takes into account the belt tensioning method. At the same time, the required value of the pre-tension of the belt can be significantly re-duced, which will have a positive effect on its resource, without losing the traction capacity of the transmission itself. Expressions are given for finding the value of the pre-tension of belts, both for gears with tension due to the elasticity of the belt, and for gears with spring-loaded tension rollers. Conclusions and directions for further research are formulated.

VIBRATION ANALYSIS EVENT OF GUIDE ROLLER MECHANISMS FROM BELT CONVEYORS

The article discusses the analysis of vibration phenomena during the operation of conveyor belt conveyor mechanisms and the process of their occurrence. The increased frequency and durability of the mechanism as a result of proper centering when installing parts of the mechanism of the guide roller, including the part that acts as a sliding base, leads to positive changes in the mechanisms of the machine.