Реферат: Привод ленточного конвейера. Червячный редуктор

<span Times New Roman",«serif»; position:relative;top:8.0pt;mso-text-raise:-8.0pt">1.         КИНЕМАТИЧЕСКИЙ  РАСЧЕТ

Проведемкинематический расчет привода ленточного конвейера, схема которого изображенана рис.1, при заданном окружном усилии на барабане F=2.7 кH, окружнойскорости V=0.18 м/с  и диаметре барабана  D=400 мм.

1.1.<span Times New Roman"">           

Привод состоит изэлектродвигателя, одноступенчатого червячного редуктора и приводного барабана.Червячная передача служит для передачи мощности от первого (I) вала ко второму (II). При передаче  мощности имеют место  ее потери на преодоление сил вредного сопротивления. Такие сопротивления имеютместо и в нашем приводе: в зубчатой передаче, в опорах валов. Ввиду этогомощность на приводном валу будет меньше мощности, развиваемой двигателем, навеличину потерь.

1.2.<span Times New Roman"">           

Мощность на приводном валу барабана (мощностьполезных сил сопротивления на барабане)

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<span Times New Roman",«serif»; position:relative;top:3.5pt;mso-text-raise:-3.5pt">где 

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чп=0.40 – к.п.д. червячнойпередачи (по таблице 1 [1]),

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пс=0.95 –к.п.д. пары подшипников скольжения (по таблице 1 [1]).

 

1.4.      Потребнаямощность электродвигателя (мощность с учетом вредных сил сопротивления)

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1.5.      Частоты вращения барабана (третьего вала)

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1.6.      Ориентировочное передаточное число привода

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где U`1-ориентировочное  значение передаточного числа червячнойпередачи (по рекомендациям [1]).

1.7.      Ориентировочныечастоты вращения вала электродвигателя.

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1.8.      Выборэлектродвигателя.

По таблице 5 из [1] выбираем электродвигатель марки4А1008УЗ, мощность которого Pдв=1.5кВт, частота вращения  nдв=700 об/мин, отношения     <span Arial",«sans-serif»; mso-bidi-font-family:«Times New Roman»;position:relative;top:18.5pt;mso-text-raise: -18.5pt;mso-fareast-language:RU;layout-grid-mode:line"><img src="/cache/referats/895/image048.gif" v:shapes="_x0000_i1048">

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1.9.      Передаточное число привода.

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1.10.    Передаточныечисла ступеней передач привода

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1.11.    Частотывращения валов привода.

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Длявторого вала

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Частоты второго и третьего вала одинаковы,следовательно, nIII=nII=17.189 об/мин

1.12.    Мощностина валах.

Мощность на первом валу

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Мощность на втором валу

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Мощностьна третьем валу (для проверки) равна Рвых

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1.13.    Моменты навалах

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<span Arial",«sans-serif»;mso-bidi-font-family:«Times New Roman»; position:relative;top:18.5pt;mso-text-raise:-18.5pt;mso-fareast-language:RU; layout-grid-mode:line"><img src="/cache/referats/895/image128.gif" v:shapes="_x0000_i1092"><span Arial",«sans-serif»;mso-bidi-font-family:«Times New Roman»; position:relative;top:14.0pt;mso-text-raise:-14.0pt;mso-fareast-language:RU; layout-grid-mode:line"><img src="/cache/referats/895/image130.gif" v:shapes="_x0000_i1093"><span Arial",«sans-serif»;mso-bidi-font-family:«Times New Roman»; position:relative;top:3.5pt;mso-text-raise:-3.5pt;mso-fareast-language:RU; layout-grid-mode:line"><img src="/cache/referats/895/image132.gif" v:shapes="_x0000_i1094">Таблица1.1Результаты кинематическогорасчетаРасчетные

параметры

Номера валов

I

II

III

Передаточноечисло ступени

U=40.724

Мощность  Р, кВт

1.293

0.512

0.486

Обороты  n, об/мин

700

17.189

17.189

Момент  Т, Н<span Times New Roman";mso-hansi-font-family:«Times New Roman»; mso-fareast-language:RU;layout-grid-mode:line;mso-char-type:symbol; mso-symbol-font-family:Symbol">×

м

17.64

284.461

270.016