Grain Storage Silos
Being aware that high-quality production is only possible by specialized personnel, modern production techniques and full-automated production, OBIAL zinc-plated steel silos and conveyance equipment are designed by the product development/design department to address all grain storage requirements and produced accordingly. High-quality zinc-plated metal sheets used in silo production resist 450 MPA and are corrosion-resistant. The custom produced metal sheets used in the production of our silos have a zinc plating standard of 450 gr/m2 and 350 gr/ m². The zinc plating ratio changes according to customer demands. OBIAL offers difference silo options, including flat and conical-bottom silos, starting from a diameter of 4.51 m diameter to 31.60 m. To be able to carry the vertical loads on the silo, vertical suspension supports mounted on the silo surface are used to yield maximum strength. OBIAL vertical suspension supports perfectly distributes the pressure put by the grain in the silo on the side walls of the silo over the bottom of the silo. To ensure maximum strength at all joints in OBIAL steel silos, Dacromet 500A coated bolts, grade 8,8, are used. To make the silos airtight and waterproof, special sealing elements are used on metal sheets on the silo frame and on the joints of upper roof. There are safe access doors that can be easily opened and closed on the second floors, and observation lids on the roofs of all OBIAL silos. The silo access door has two layers; the outer layer is made up of a single piece of zinc-plated sheet, and the inner layer is made up of two doors placed one on top of the other. If the grain fill-level of the silo has gone up the access door on the silo side wall, the observation lid on the roof allows access into the silo. In all OBIAL silos, there are inner stairways to enter the silo, a safety cage external stairway to access silo observation lid on the outer surface of the silo, and a platform to rest. And there are double-railing and safety roof stairways on the roofs to be able to reach the top point of the silos starting from the eaves. OBIAL silo roofs are among the strongest silo roofs worldwide. OBIAL silo roofs are designed to resist the loads from upper roof conveyance equipment, snow loads, wind loads and the weight of temperature cables. The slope of the 30 degree silo roofs ensures an optimum fill level for the silos. To reinforce the strength and endurance of the upper roofs of wide grain silos, they are designed as cages using special cross-section profiles. The strength of the silo roof is maximized thanks to this architecture. The temperature command system used in OBIAL silos allows us to identify hot spots and insect activities, freeing our customers from reinstalling the grain conditions on the screen. The OBIAL temperature command system consists of temperature cables, temperature sensors installed inside the cables to measure the grain temperature, and portable or stationary temperature screens. There are special steel ropes inside the temperature cables, protecting the cables against elongation. The temperature command system is aligned with the PLC to allow for controlling the grain temperature inside the silos via the PLC screen.
OBIAL conical bottom grain storage steel silos can be used for multiple purposes. Conical bottom steel silos’ conical bottom angles are produced at 45-65 degrees according to the type and flow characteristics of grain to be stored. Conical bottom steel silos can especially be used in animal farms handling storage operations of various types of grains, and in facilities including feed and flour mills. They are also optimum for short-term and temporary grain storage. Side wall sheets, suspension supports and access doors of all OBIAL conical bottom silos are made up of zinc-plated steel sheet. Steel, due to its structural characteristics, is very resistant in conical bottoms. OBIAL offers you conical bottom steel silo options in various sizes and capacities from 2,11 m to 10,83 m.
Grain Handling Systems
Theelevatorsystem is designedforgrainsand is
All OBIAL elevatorsystemsconsist of a column, driveunitcap, a tensionunit, andzinc-platedsheet. Bucketsusedforverticalconveyance of grainsarestandardplastic, metal orzinc-plated metal bucketsspecificallyproducedby OBIAL.
Duetothewatertightproperties of the motor group (IP 55) located at thecap of theelevatorsystem, it needsnocover. Drive fromthe motor tothereducer is through a V-beltpulley. Thereducer is directlyconnectedtothedriveshaft. Thereare 2 observationlids at thecap of thedriveunit, allowingeasyaccessandmaintenance. Theinnerpart of thecap is coatedwithrubbertomake sure thegrainsareconveyedtothedistributorwithnodamage. Andthecylinderoverthecap is rubbercoatedtopreventslipping of thebeltandskidding.
Thereare 2 observationlidsagainforease of access at thefooting of theelevatorsystemand 2 portablelidstomakecleaningeasier. Thetensioningunitmadeup of zinc-coatedsheettensionsthebelt, whichbecomeslooseduringsummerduetoweatherconditionsandextendeduse, preventing it toperformlesseffectively. Thelowercylinderconsists of a steelcagetopreventthegrainsfrombeingconveyedthroughthegrainintakelidandthebeltfrombeingreleased.
OBIAL chain conveyors are available with capacity rangingfrom 45 up to 500 t/h.
OBIAL chain conveyors transport the grain horizontally orangularly, free of damage and in an economical way.
All OBIAL conveyor chains are extra hardened to operateunder hard working conditions. Grain carrying scraper flights efficientlyreduce the friction between the chain rails and the surface of conveyor box,they are made of plastic derlin material, connected by bolted system andassembled on the conveyor chain rails. Chains move easily inside the conveyorbox on special derlin plastic bobbins which are located inside the conveyor andclosely spaced. The chain conveyor sprockets are made of steel and extra-hardenedby cementation. In comparison with welded conveyors which consist of onecomplete part, the repair, maintenance and assembly of the OBIAL conveyors aremuch easier because of the complete bolted system used.
Specially designed for intake pits, OBIAL chain conveyorshandle the grain free of damage and with high performance.
Produced from Magnelis sheets, OBIAL multipath distributors are used in distributing the grains and are located under the upper cap of the elevator. Thanks to its insulated structure, it doesn’t permit release of dust. Screw assembly system is used on all joints of the distributor. The flow path of grains may be set as desired using a switch. OBIAL distributors are being produced with a capacity and strength to ensure problem-free operating in high-tonnage filling and discharge systems. The motors and sensors used on the distributor can easily be disassembled and replaced in case of any failure. The distributor frame also houses an observation lid to monitor the flow and to detect and remedy any failure and clogging in the distributor piping.
The lower discharge conveyor helps the grains in the silo to be conveyed out of the silo. Thanks to the lids over the conveyor system and the mechanism commanding these lids, the silo can be safely discharged. The command centre first opens the central lid, not letting other lids to be opened. After the flow from the central lid ends, the other intermediate lids are opened. The conveying system is produced from zinc-plated sheets. The power is directly conveyed from the motor reducer to the drive shaft in the conveyor. This ensures a more efficient and safe operation of the conveyor.
And, OBIAL bottom cleaner conveyor discharges the grains remaining at the bottom of the silo by rotating 360 degrees around itself. The suspension bed system and the steel cage system are made by estimating the grain load falling on them. The drive and motion units are designed individually. This permits the maximum use of bottom cleaning conveyors.
Grain Dryer Systems
Working Principle Fan aspirates air into combustion room
through shutters and forms a controlled mixture with the gas coming from
installation. This mixture is burned by the burner. The heat formed advances
along combusTİon room with the help of burner fan and upper aspirating fan and
passes through transiTİon channel and is transmitted to air channels of product
chamber. Thereby heat is transferred to product and some of heated air is
extracted in a controlled manner and remaining heated air enters the system
again and is mixed with the atmosphere air received from cooling shutters. Air
is irculated along the system in order to reduce its humidity (saturation).
Humidity of the product within this loop is reduced to desired humidity ratio
and then product asses from unloading mechanism to hopper and exits the system.
Grain which is equal to the amount of product leaving the system is added to
system with the help of sensors. It is prevented that heat goes toflow pipe
through transition connection by means of this adding process. 1.) It has
galvanized and thoroughly fixed strong base structure.
1.) It has galvanized and thoroughly fixed strong base structure.
2.) It allow to work easily under different products and product conditions thanks to grain intake system.
3.) Interior roof and supports ensure that humidifiedgrain passes through chamber as granulated.
4.) Turbulent air circulation is avoided thanks to low static pressure and homogenous heat dissipation.
5.) In emergency situations, machine's burning system is closed thanks to heat sensors.
6.) Temperature values is increased to maximum value from nominal by means of air mixer.
7.) Burners keep temperatures needed fixed continuously.
8.) Burner system consists of Elster Krom Schröder or Dungs brand high-safe devices.
9.) Burner system is worked by using fuels like LPG, LNG (in gas phase) and NG
10.) Grain within chambers is kept under control with emergency unloading covers.
11.) Grain storing chamber is automatic controlled and it controls feeder elevator and provides electric saving.
12.) It keeps the product within chamber without loss thanks to unloading which is made invariable by pneumatic system and desired unloading time is adjusted by means of timing mechanism.
13.) It is ensured that fans are protected from external conditions with the fan shutters fixed by
14.) High capacity fans are covered by metal sheets, black sheets and coated with static paint and burners are covered with stainless and galvanized metal sheets. Doors and covers opened into these
sections allow easy intervention.
15.) Heat loss is reduced to minimum thanks to external heat-insulation.
16.) Whole heat flow, air flow and temperature values within the system are reached and adjusted
with the Siemens control panels (PLC).
Grain Cleaning Systems
World population has gradually increased and, as the result
of this increase, cultivation areas of grain group which is one of the basic
requirements of human have been expanded. As parallel with this expansion the
grain group should be stored for short and long term. Since the grain group is
not in pure situation within the place stored after harvesting, it should be
cleaned from foreing matters i.e. from grass, stones and sands. While screening
process made manually in sieves continued day after day in the past, the
systems which sieve tons of grain per hour have been developed thanks to
state-of- the-art technology nowadays. The name of this unit is pre-cleaning
unit. Precleaning consists of 5 main components as of its general strcture:
Drum case, drum, upper chamber. It has high resistance against corrosion. 10,9
quality class bolts have been used as fastening element. Bolts ant nuts are
dacromate plated and have high yield strength. St 37 quality black sheet has
been used for cyclone and its parts have been joined by means of welding.
In order to increase resistance against corrosion, 2 coats of primer have been
applied and 1 coat of paint has been applied over primer.
Product which enters hopper placed in upper chamber (aspiratör) through the elavator which is the silo equipment is transported to rotary durm within the main case While product is ﬂowing into drum, dusts and substances lighter than air within product is drawn by radial fan mounted back of upper chamber and transmitted to cyclone mounted near the radial fan, It is ensurded that the product ﬂows as horizontal by gving suitable inclination angle to rotary drum so that product sieving process will be carried out in rotary drum and the product is passed out in rotary drum and the product is passed through screens winded around rotary drum. Intermediate chambers within main case avoid materials which are separated after being passed through screens from mixing with the others and allow the materials to transfer into conveyor through bottom pouring compartments.
There are walkways and rest platforms on all OBIAL silos. The calculations of walkways are made in consideration of the clearance of support legs, load from the chain conveyors on them, wind load, snow load and other moving loads and produced accordingly. Assembled using screws, the modular system can easily be assembled, needing no maintenance since it is zinc plated.
All safety constructions can be custom produced as dyed or zinc-plated. All safety constructions are produced using angle iron and are fully joined using screw-type assembly, without any welding. The safety constructions also come with options including a service platform and stairs.
Ventilation and Air Conditioning Systems
capacityandthecharacteristic of thegrainto be
storedareinstalledintotheconcreteduringthelaying of thefoundationconcrete.
OBIAL uses ALFAN brandedradialandaxialfansinvaryingcapacitiestoventilatetheproductsstored in thesilos of varyingsizesandcapacities.
OBIAL ventilationchimneysallowfortheeasydischarge of dustformationandpesticides inside thesilos. Thesechimneysaresloped, withwirecurtains on theirfrontsurfaces. Thesecurtainspreventbirdsandotherforeignobjectsfrompenetratingintothesilos. Andthankstoitsslopedstructure, it preventsrainandsnowtopenetrate.
Wheremoreairoutlet is needed, OBIAL produces a ventilation fan with a wingdiameter of 560 mm. Thisfan’sairsuctiondirectioncontains a wirecurtain, withtheairoutletdirectionhaving a louveredstructure. Louversopenduring fan operation, andaredesignedsothattheyareshutwhenthe fan stops.
OBIAL also produces portable tunnel ventilation canals strengthened by corrugating and joining zinc-plated sheets to solve the ventilation problems in horizontal grain storages.