2 Обладнання для тарного зберігання борошна

Мішки з борошном з автомобілів, вагонів та інших перевізних пристроях на хлібозаводах вивантажують вручну. Мішки з борошном доставляють на склад за допомогою наступних механізмів і пристосувань: автонавантажувачем на піддонах по 12 мішків (4 ряди по 3 мішки); на медведках (по 1—2 мішки), візках з піднімальною платформою і вузькоколійними візками (по 10—20 мішків); пересувними стрічковими і пластинчастими конвеєрами і гравітаційними рольгангами; валковими чи вильчатими утримувачами мішків, шахтними підйомниками, гвинтовими гравітаційними спусками та ін.

Борошно в мішках необхідно штабелювати трійниками (по три мішка) на піддонах (стелажах). Кількість рядів у штабелі по висоті складає: при укладанні автонавантажувачем 12 рядів (3 піддони по 4 ряди), при ручному укладанні—8 рядів.

Для укладання мішків з борошном у штабелі і розбирання штабелів застосовують штабелери — похилі стрічкові і пластинчасті конвеєри з регульованим кутом нахилу, тельфери та ін.

Для вільного обслуговування в борошняних складах ширина проїздів передбачається: при транспортуванні мішків з борошном автонавантажувачем – не менш 3.5 м; на візках — не менш 2,5 м; на медведках – не менш 1,5 м. Проходи від штабеля до стіни повинні бути не менш 0,5 м, а між штабелями – 0,75 м (проходи повинні бути не рідше чим через 12 м).

Рисунок 2 Схема перевертача мішків:
1-утримувач мішків; 2-шипи; 3-перекидач; 4 і 6-стрічка перекидача; 5-завальна яма; 7-мішок з борошном; 8-візок медведка.

Для звільнення мішків від борошна і прийому борошна в завальну яму застосовують перевертачі мішків. Схема перевертача мішків приведена на рис. 2. Основною частиною механізму є утримувач мішків 1, у якому щільно розміщається мішок з борошном 7. На стінках утримувача мішків 1 розміщено 30 сталевих шипів довжиною 4-6 м, з нахилом униз 50-60°, що утримують спорожнений мішок при висипанні з нього борошна в завальну яму 5.

На підприємствах із пневмотранспортом борошна для прийому борошна в мішках, її вивантаження і подачі в пневмопривід застосовують приймач для борошна з вибивачем мішків ХМП-М.

Приймач (рис. 3) має завальний бункер із захисним ковпаком. Нижній отвір лійки прийомного бункера відкривається в горловину шлюзового живильника. Біля передньої крайки завального бункера розташований піднімач мішків із пневматичним плунжерним прийомом, що включається за допомогою пневмокрана. Отримувач мішків забезпечений пристроєм для пневматичного очищення мішків і служить також для аспірації. 

Повітря очищається від борошняного пилу в двох паралельно працюючих циклонах, а відсмоктується вентилятором. Щиток служить для уловлювання надлишкового повітря. Борошно з живильника стисненим повітрям подається в бункер для безтарного зберігання.

Рисунок 3 Приймач для борошна ХМП:
1-піднімач мішків; 2-бункер; 3-шлюзовий живильник; 4-циклон; 5-вентилятор; 6-привод; 7-горловина для пневматичного очищення мішків.

Технічна характеристика приймача для борошна з вибивачем мішків марки ХМП приведена в таблиці 1.

Таблиця 1-Технічна характеристика приймача для борошна ХМП

Показники Значення
Продуктивність приймача борошна, мішків/год 60
Продуктивність вентилятора, м3/хв. 40
Частота обертання вентилятора, хв –1 20810
Напір (робочий тиск), кПа 20-35
Потужність електродвигуна кВт 9,1
Габаритні розміри, мм;  
       довжина 2479
       ширина 2637
       висота 2970
Маса, кг 1170

Для очищення порожніх мішків від залишків борошна і борошняного пилу застосовують вибивач мішків. У цій машині мішок піддається впливу обертових бил. Для очищення мішків із сукна, що були у вживанні від борошняного пилу і тістових кірок застосовують машини Г4-БОК-200 і БВЦ. Технічна характеристика цих машин приведена в таблиці 2

Таблиця 2-Технічна характеристика вибивачів мішків

Показники Г4-БОК-200 БВЦ
Продуктивність, мішків/год. 200  
Частота обертання вала, хв-1 440 440
Частота обертання вентилятора, хв.-1 930 930
Габаритні розміри, мм:    
       довжина 1900 1575
       ширина (діаметр) 1500 890
       висота 3450 1325
Витрата повітря, м3/хв. 53 41
Потужність електродвигуна, кВт   3,0
Маса, кг 787 250
Кількість борошняного пилу, що
вибивається з 100 мішків
7-20  
Розміри мішків, мм:  
       довжина 850-900
       ширина 610-690

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