1. Casing
Elevator will consist of boot section, intermediate casings and head section. Elevator boot, intermediate casings and head casing will be of welded/bolted construction fabricated from rolled steel mild steel angle section and sheets. The sheet thickness for the intermediate casings and head casing will be 3 mm whereas for the boot section and the receiving chute, sheet thickness will be 5 mm. the height of intermediate casings will normally not exceed 1.8 - 2.5 metres. The casing will have provision for being bolted together.
Boot section will be provided with inspection door on both sides and also small cleaning door on both sides. Inspection doors will be provided in one or two of the intermediate casings to permit visual inspection, cleaning and replacement of buckets
2. Head Section
Head section will be provided with a crowned head pulley of mild steel plate welded construction. The pulley face will be straight approximately for 1/3rd face length in the centre. For the balance portion on both sides of the straight length, the pulley will have crown. The pulley will be keyed on to m.s. shaft which will be mounted in externally lubricated self aligning ball bearing plummer blocks of C.I. construction. Pulley and bearing blocks will be supplied loose for assembly at site.
3. Boot Section
Boot section will be provided with slatted bottom pulley (also designated as tail pulley) of m.s. construction mounted in externally lubricated ball bearing plummer blocks which will be fitted in gravity type take-up device. Pulley and bearing blocks will be supplied loose for assembly at site.
4. Take-Up Device
Weighted lever type take-up device will be provided at boot section. Allowance for belt elongation will be 200 mm.
5. Drive Unit
Elevators will be head driven. The drive motor will be totally enclosed fan cooled squirrel cage induction motor suitable for operation on 415 V, 3 phase 50 c/s. A.C. supply system. The motor will be continuously rated to comply with IS-325. The motor will be coupled to the head pulley through an oil immersed worm reduction gearbox to obtain belt speed of approx. 68-70 metres/minute. Brake drum coupling will be used between motor and reduction gear. Flexible coupling will be used between reduction and head pulley. The drive motor and gearbox will be mounted on a common m.s. fabricated base frame. All components will be supplied loose for assembly at site.
6. Anti-Roll Back Device
Anti roll back device in the form of magnetic brake will be provided and this will be fitted on brake coupling
7. Belting
The belt will be nylon fabric, 800/5 ply, Grade M-24 or heat resisting quality with 3 mm bottom and 1.5 mm top covers. Belt will conform to IS-1891 Part I and Part II as applicable. The belts
if within Wesman’s scope of supply will be supplied as open ended
belts.
8. Guide PlateIn order to protect the belt from swinging during operation, guide
plates will be provided at suitable intervals inside elevator casings
9. BucketsThe buckets will be fabricated from 3 mm thick m.s. sheet with
reinforced adges and will be provided with replaceable rubber sheet on
the inside. The buckets will be spaced on the belt at 400-500 mm pitch
and will be fixed to the belt by means of fang bolts. Holes on the belt
for fixing the buckets will be punched at site during erection and assembly.
10. Drive PlatformEach bucket elevator may provided with drive platform for maintenance
of the drive unit if Specifically ordered by client. Drive platform
will be approximately 600 mm wide spaced on both of its sides to attend
to the drive unit. Drive platform will be covered with 5 mm thick O.P.
chequered plate. Hand rails made from angles and flats or 20 mm O.D.
light section ERW pipe will be provided for the drive platfo
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