첨부 #2_ITB - Annex a - Technical Specifications
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J320202-JES-ME-SPE-101/A4 Page 21 of 40 It shall be mounted in such a position that material collected by the scrapper is discharged in main discharge chute of the conveyor. 4.6 .18.3 Internal scr appers (pl ough scr app er) Internal „V plough type scrapper of suitable design shall be provided on tail side of the conveyor to divert any material that may fall on the clean side of the belt and restrict it from entering into tail pull ey. It shall be V-sh aped, hi nged on one side and po inting tow ards the hea d pulleys . The plough made of mild steel flats and hard rubber strips without any fabric shall be provided with suita ble arrangemen t to press the wiping edge gently but firmly against the belt. Scra pper blade of molded rubber shall be adjustable type. 4.6.19 CONVEYOR SUPPORTING STRUCTURE 4.6 .19.1 All bel t convey ors shal l be provided with str ingers and sup por ts thro ughout the len gth of the conveyor. All head and tail sections shall be designed to resist all loads including belt tensi ons. 4. 6. 19.2 Al l st ruct ure li ke st ri ngers, suppor ts, head and tail fr ames shal l be fabr icate d fr om angle /chann el/beam rolled stee l section. In case of belt width s1000 mm and abov e, conveyors shall have stringers/short supports fabricated from minimum 150 mm depth channel. 4.6 .19.3 All cross braci ngs requir ed for str ing ers/short sup por ts shall be fabricated from rol led st eel sectio n of suitab le size. The base plates , splice plates, gusset plates shal l be of mini mum 10 mm thickness. 4.6 .19.4 As a general rul e, clearance around all mach inery t o near est fix ed obstru ctio n shall not be less than 1.0 m. The re shal l be access for belt renewal , vulcani zi ng and repl acement of maj or components. 4.6. 19.5 The de flecti on of c onvey or gird ers shall not exceed 1/500t h (0-2%) of t he sup porting span. 4.6.20 SAFETY SWITCHES 4. 6. 20.1 Be lt sway swit ch Spacin g betw een two swi tche s sha ll not excee d 50 m. Switc h shal l be Form C Single Pole Doubl e Throw type (SPDT), manua l reset type wit h 2No+2Nc contact s. Minimum two switches shall be provi ded. One pair shall be at head end and other shall be at tail end. 4. 6. 20.2 Pull cord switches These switches shall be of industrial, heavy-duty type enclosed and vermin proof with indirect arr ang ement for ope rat ion. The swi tches shal l be oper abl e in bot h dire ctio ns wi th aut omat ic locking arrangement in the operating position and shall be manually reset type with 2No+2Nc conta cts. Spacin g between two switch es shall not exceed 30 m. These switc hes shall be Form C (SPDT) type. Required shackles shall be provided on each support. These switc hes shall be provided along each walkway side of each conveyo r. 4. 6. 20.3 Zero speed swit ch zero speed swit ches shall be provided on tail pulley for each conveyor. These switch es shall be Form –C (SPDT) type. It shall be proximity non-contact type .The electronic unit for zero speed swit ches shall be in FRP enclosu re 4.6.21 CONVEYOR DRIVE BASIS OF DESIGN FOR FERTILIZER&PHOSPH ATE CONVEYIN G SYSTEM - J320202-JE S-ME-SPE- 101
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Technical Specifications
Transcript of 첨부 #2_ITB - Annex a - Technical Specifications
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J320202-JES-ME-SPE-101/A4
Page 21 of 40
It shall be mounted in such a position that material collected by the scrapper is discharged inmain discharge chute of the conveyor.
4.6.18.3 Internal scrappers (plough scrapper)
Internal V plough type scrapper of suitable design shall be provided on tail side of the conveyorto divert any material that may fall on the clean side of the belt and restrict it from entering intotail pulley. It shall be V-shaped, hinged on one side and pointing towards the head pulleys. Theplough made of mild steel flats and hard rubber strips without any fabric shall be provided withsuitable arrangement to press the wiping edge gently but firmly against the belt. Scrapper bladeof molded rubber shall be adjustable type.
4.6.19 CONVEYOR SUPPORTING STRUCTURE
4.6.19.1 All belt conveyors shall be provided with stringers and supports throughout the length of theconveyor. All head and tail sections shall be designed to resist all loads including belt tensions.
4.6.19.2 All structure like stringers, supports, head and tail frames shall be fabricated fromangle/channel/beam rolled steel section. In case of belt widths1000 mm and above, conveyorsshall have stringers/short supports fabricated from minimum 150 mm depth channel.
4.6.19.3 All cross bracings required for stringers/short supports shall be fabricated from rolled steelsection of suitable size. The base plates, splice plates, gusset plates shall be of minimum 10mm thickness.
4.6.19.4 As a general rule, clearance around all machinery to nearest fixed obstruction shall not be lessthan 1.0 m. There shall be access for belt renewal, vulcanizing and replacement of majorcomponents.
4.6.19.5 The deflection of conveyor girders shall not exceed 1/500th (0-2%) of the supporting span.
4.6.20 SAFETY SWITCHES
4.6.20.1 Belt sway switch
Spacing between two switches shall not exceed 50 m. Switch shall be Form C Single PoleDouble Throw type (SPDT), manual reset type with 2No+2Nc contacts. Minimum two switchesshall be provided. One pair shall be at head end and other shall be at tail end.
4.6.20.2 Pull cord switches
These switches shall be of industrial, heavy-duty type enclosed and vermin proof with indirectarrangement for operation. The switches shall be operable in both directions with automaticlocking arrangement in the operating position and shall be manually reset type with 2No+2Nccontacts. Spacing between two switches shall not exceed 30 m. These switches shall be Form C(SPDT) type. Required shackles shall be provided on each support.
These switches shall be provided along each walkway side of each conveyor.
4.6.20.3 Zero speed switch
zero speed switches shall be provided on tail pulley for each conveyor. These switches shall beForm C (SPDT) type. It shall be proximity non-contact type .The electronic unit for zero speedswitches shall be in FRP enclosure
4.6.21 CONVEYOR DRIVE
BASIS OF DESIGN FOR FERTILIZER&PHOSPHATE CONVEYING SYSTEM - J320202-JES-ME-SPE-101
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