The 10 reference contexts in paper A. Lebedev T., N. Valuev V., N. Mar'in A., R. Pavlyuk V., A. Mar'in N. (2017) “TECHNO-ECONOMIC MODEL OF COMPARATIVE ASSESSMENT OF EFFICIENCY OF RESOURCE INCREASE OF FRICTION PAIR «DISK - GASKET» OF PNEUMATIC SEEDING MACHINE” / spz:neicon:stavapk:366

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    E-mail: t707oa@rambler.ru P neumatic vacuum seeder-cultivators «Millerovoselmash», «John Deere», «MashioGaspardo», «MaterMacc», «Monosem», «Kunh» and others, both domestic and imported, with disk sowing attachment are most widely used for planting row crops. Exchangeable metering disks provide accurate sowing of sunfl ower, corn, sugar beet and other row crops
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    . Planting attachments of lower position due to lack of seed hoses improve the uniformity of distribution of seeds in a row but operate in the area of dusty air with increasing concentration of powdered abrasive which gets into the friction zone of metering disks and gaskets.
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    Selecting metering disks and gaskets only by their resources does not allow to reliably determine the effectiveness of these metering disks and gaskets. Therefore, different approaches are used for comparative evaluation of effectiveness of different types of metering disks and gaskets
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    . Prerequisite of reliable assessment of a metering disk and a gasket of different manufacturers is reliability of implemented technological process of planting crops with the index of at least 0.97 in all compared cases.
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    challenge to increase the effi ciency of use of agricultural technology is the development of activities and ways to increase resources and reduce time spent on the restoration of operability of units and parts. This problem is most acute during planting row crops which takes place in short agrotechnical terms and is associated with biological characteristics of seed germination of plants
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    . To develop ways of increasing the resources of the friction pair «disk – gasket», the life cycle of existing serial metering disks and gaskets will be considered. Changing the thickness of a metering disk and a gasket before reaching their limit values are graphically represented as curve 1 (Fig. 1).
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    Then, when the wear hв (point A) is reached, the process of wear is intensifi ed due to increased vibration and continues as long as the thickness of the metering disk and the gask hпр et does not reach the maximum permissible value . Period T characterizes the work of sowing attachment which does not comply with agro requirements
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    . Service life of a serial seeding set can be determined by the formula TTT. (1) Figure 1 – Scheme for serial and proposed lifetime of the friction pair «disk – gasket» Achieving this specifi ed limit may be regarded as a failure of the friction pair «disk – gasket» because in this period overrun signifi cantly increases and missing of seeds is observed, an
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    the formula TTT. (1) Figure 1 – Scheme for serial and proposed lifetime of the friction pair «disk – gasket» Achieving this specifi ed limit may be regarded as a failure of the friction pair «disk – gasket» because in this period overrun signifi cantly increases and missing of seeds is observed, and further operation is inappropriate for economic reasons
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    . Thus, the time period T can be regarded as the main stage of the life cycle of the friction pair «disk – gasket» upon completion of which it is necessary to replace them. Total value of wear of the friction pair hв of a seeding set should be determined to control and scientifi cally validate reasonability of this period of operation ТПР.
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    This development of the state of the working surfaces of the friction pair «disk – gasket» is described with the curve 2 in Figure 1. However, due to different seasonal load under real production conditions this value cannot be accepted as an objective characteristic for replacement of a set
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    . Figure 2 – Techno-economic model of implementing a given volume of seeding row crops and total costs for a serial seeding set Analysis of the given above leads to the conclusion new working position of the disc with replacement of gasket [8–10].
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    Figure 2 – Techno-economic model of implementing a given volume of seeding row crops and total costs for a serial seeding set Analysis of the given above leads to the conclusion new working position of the disc with replacement of gasket
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    . Costs associated with the work to increase the share of the fi rst proposed method (Fig. 4) can be identifi ed as: 1 , (7) where ЗПЕ – the cost of reinstallation of agitator fl ags to another working position, rub.
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    Consequently, to implement the proposed approach to improve the effectiveness of work of the proposed friction pair «disk – gasket» it is necessary to ensure the wear resistance of working surfaces of friction pairs «disk – gasket» which is 1.5–2 times greater than a serial friction pair has
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    . From this point of view, we have proposed a number of technical solutions that meet their stated objectives (Fig. 3). Figure 3 – Areas of resource increasing of the friction pair «Disk – gasket» of sets row of sowing drills To maintain a healthy state by the fi rst method a serial dispensing disk and the gasket operatetillwear hв, followed by reinstalling the agitator fl
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    of predetermined volume seeding row crops when reinstalling the agitator fl ags on the metering disk (method 1) Please note that you need to perform operations on the life extension of the metering disk and gasket, and replace them when they reach defect wear in order to avoid the additional costs associated with the loss of seed as a result of reseeding and insuffi cient sowing
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    . One of the promising areas to increase the durability of the friction pair «disk –gasket» is the saturation of the protrusions gasket antifriction lubricant in the area of contact [12]. The solid lubricant produces the thinnest protective fi lm penetrating into existing micro pores on the surface of sliding parts, reduces plastic deformation of the material, promotes redistribution o
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    extension of the metering disk and gasket, and replace them when they reach defect wear in order to avoid the additional costs associated with the loss of seed as a result of reseeding and insuffi cient sowing [11]. One of the promising areas to increase the durability of the friction pair «disk –gasket» is the saturation of the protrusions gasket antifriction lubricant in the area of contact
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    . The solid lubricant produces the thinnest protective fi lm penetrating into existing micro pores on the surface of sliding parts, reduces plastic deformation of the material, promotes redistribution of pressure and thus provides a favourable running surfaces, thus increasing the product life, to reduce the loss of working time because of the fault and higher productivity (fi g
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