Pressure Resistent-Gravimetric Feeder

8/13/2019 Pressure Resistent-Gravimetric Feeder

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Pressure-ResistantGravimetric Coal Feeder

This is a continuous weighing

machine used to weigh and feed

specified amount of coal from the

coal storage tank directly into the

pressurized mill.

1.Dust-proof, explosion-proof load cell

4. Cylindrically-shaped Pressure-Resistant Chamber

Its airtight design does not allow any air to leak out.The cylindrical inlet chute allows the maximum constantflow of coal from the coal storage area----indispensablein securing maximum efficiency.

2.User-friendly controller CFC-300The CFC-300 makes zero and span ad-justments digitally, without bothersomeanalogue adjustments. The adjusted val-ues are calculated automatically andstored in memory by pressing a key.The CFC-300 incorporates Programma-ble Logic Calculator functions.

A dust-proof, explosion-proof load cell is

incorporated as the weighing sensor.

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3.A specially designed conveyor belt & clean- out conveyor

The conveyor belt is equipped with corrugated lugs (60mm H) to prevent coal from spilling over the sides of thebelt. The design and materials used in the conveyor beltleave no gaps.The clean-out conveyor underneath collects any spilledcoal to prevent accumulation and eliminate a possibilityof natural flashing.


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Advantages

Load cell

The dust-proof, explosion-proof loadcell yields a linearity of +/- 0.05%.The load cell supports the weighingcarrier rollers directly, retaininghighly accurate weight readings.

The conveyor belt

The conveyor belt is equipped withcorrugated lugs which spread whenthe belt passes over rollers, toprevent coal from spilling over thesides of the belt.

Rubber l agging covered head rolle r

The head roller is covered withrubber lagging, which helps preventthe accumulation of coal on thesurface of the roller, and keeps theconveyor belt from skiddingsideways.

External belt cle anerThis cleaner scrapes coal off the topsurface of the conveyor belt.The stainless steel blade is keptpressed against the surface of thebelt by a counterweight.

Clean-out conveyorThe clean-out conveyor is installedin the bottom of the chamber, rightunder the conveyor belt. It sweepsany spilled coal or dust into the mill,to prevent an accumulation of spil-led coal.

Inspection light (2 points)Inspection lights are installed tomake it easy to inspect the inside ofthe chamber through the inspectionwindows.

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Carrier rollerarrier rollers are installed to re-ce conveyor belt friction, causedthe head pressure of the coal.

Air sealThe air seal keeps the coal dustfrom blowing back into the coalfeeder.

Side rollers (4 points)Side rollers are installed at 2 pointson either side of the return belt, toprevent undesirable belt skidding.When in contact with the belt, theyrotate smoothly.

Poking hole and aspirated a irA poking hole is provided in thechamber to allow operators to breakclogging in the outlet shute with astick through it. When the hole isopen, aspirated air will blow to pre-vent the coal dust from being blownout.

Internal belt cleaner & tail rollerThe cleaner scrapes any coal offthe underside of the conveyor belt.The tail roller is covered with a rub-ber lining to prevent an accumula-tion of coal.

Inspection door & windows (5 points)n inspection door and 5 windowse installed to make service andaintenance easy.

Inspection window with air cleanerSix inspection windows are installedto allow inspection inside the cham-ber.An air cleaner can be activated toclean the inside of the inspectionwindows.

Detecting an insufficient amount of

coal being fedClogging in the inlet mouth is easilydetected by the stainless steel pad-dle switch, which transmits a paddlesignal to indicate that an insufficientamount of coal is being fed.

Detecting clogging in the outletClogging in the outlet mouth is easi-ly detected by a paddle switchwhich is activated when pushed upby the coal overflowing the mouth ofthe outlet.

The control panelAll the instruments used to control the coal feeder

are installed in the control panel---each coal feeder

has its own panel (standard).

The control panel houses the CFC-300 controller,

motor controller, etc.

Both an indoor and outdoor type are available,

depending on the installation location.

The interface to the upstream control room is

made from the control panel.

Principle of operationThe coal in the coal bunker is fed on the conveyor belt (weigh-

ing belt) inside the pressure-resistant chamber, through the

coal gate and the downspout.

The chamber inlet chute is cylindrically-shaped to maximize

loading efficiency.

The load cell installed beneath the conveyor belt measures the

amount of coal discharged from the conveyor belt into the mill

as a load factor (kg/m) when it passes over the weighing sec-

tion. The belt speed (m/min.) is detected by the pulse genera-

tor attached to the driving unit.

These two signals are multiplied in the control panel to gener-

ate an instantaneous feed rate signal (kg/m x m/min. =

kg/min.). The signal is compared with the feed rate setting, PI

adjusted, and used as a motor control signal to control the va-

riable speed motor in order to achieve the desired feed rate.

The feed rate setting supplied from the central control room al-lows automatic remote control.

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1. User-friendly operationThe CFC-300 does not require any analogue adjust-

ments. The zero and span settings can be adjusted

digitally. The adjusted values are calculated auto-

matically and can be stored in memory just by

pressing a key.

2. Built-in Programmable Logic CalculatorA built-in Programmable Logic Calculator is incorpo-

rated in CFC-300 as a standard feature.

All of the relay circuits and the PLC ---normally re-quired for controlling the clean-out conveyor, the

sampling device, and local control box--- have been

eliminated. The parameter settings for system con-

trol can be changed easily in the CFC-300.

3. Self-diagnosisSelf-diagnosis functions have been incorporated to

detect load cell errors, CPU errors, and other prob-

lems.

4. InterfaceRS232C and RS422 ports are incorporated as stan-

dard. This allows setting the feed rate from an up-

stream PC, as well as collecting the weighing re-

sults.

5. Error history memoryThe time and duration of errors are recorded in a

history log and can be displayed or reviewed.

This will help operators to figure out what caused

the errors.

6. Volumetric operation switchoverThe load cells and speed detectors are always

monitored.

The mode is automatically switched over to volumet-

ric operation, if and when an error occurs.

CONTROLLER

CFC-300F E A T U R E S


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We custom-make specially-designed

coal feeders if a special inlet mouth size

or a special pitch is required between the

inlet and outlet mouths.

Coal sampling deviceThis device is used to sample the coal inside the chamber.

Automatic and manual types are available.

Coal gateIt is positioned between the coal bunker and the

downspout of the coal feeder, to stop the coal flow

when you need to perform service, maintenance,

etc.

Automatic and manual types are available.

MiscellaneousDownspout

Coal flow monitor

Dresser coupling

Explosion-proof electric parts

Coal chute

We also custom-make coal feeders

equipped with both feeding and weigh-

ing conveyors inside the chamber that

will allow a flexible layout with a vari-

able distance between the inlet and

outlet mouths.

Coal sampling device


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Model GM-BSC22-26-10 GM-BSC22-36-10

Downspout size 26 inch (660.4mm) 36 inch (914.4 mm)

Feeding capacity max. 120 tons/hr. max. 180 tons/hr.

Weighing accuracy +/- 1/200

Setting mode Instantaneous value setting modeControl mode control

Product coal

Bulk densit 0.6 ~ 1.0

Particle size 70 mm maximum

Weighing length 500 mm

Coal weight / m 70 kg/m 100 kg/m

Belt width 850 mm 1,150 mm

Belt Flexible belt with corrugated lugs

Inlet mouth 660.4 mm Dia. 914 mm Dia.

Outlet mouth 750800 mm 7501,200 mmPitch (between inlet and outlet mouths) 2,134 mm

Chamber diameter (inner) 1,200 mm 1,500 mm

Chamber thickness (wall) t 4.5 mm t 6 mm

Drive motor weighing conveyor Inverter motor

clean-out conveyor General purpose motor

Reduction gear Shaft-mounted reducer

Net weight 2,500 kg 3,800 kg

DIMENSIONS

G M -B S C -

Dimensions for G M -B S C-

Unit(mm)

7

.external

.external

Light Light Inspection window

Inspection door

Belt-skiddingadjusting device

Driving motor forweighing conveyor

Paddle switch

-hole forinstalling the coal feeder

Driving motor for clean-out conveyor

internal

internal

internal

internal

Inspection window

Inspection window


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G M -B S C

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The GM-BSC11 was first developedin 1980.This model was designed to allow theentire weighing conveyor to beremoved easily from the chamber, forsimplified maintenance.

We remain ready to meet diverse requirements by manufacturing the following two

models which were developed in the 1980s.

G M -B S C

This model was designed to allow theweighing belt, the head & tail rollers,and the carrier rollers to be removedthrough the windows built in bothsides of the chamber, allowing easiermaintenance in a limited floor space.The current model, the GM-BSC22,was based on this earlier model.


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The contents of this catalogue are subject to change without notice.

YAMATO SCALE CO., LTD5-22 Saenba-cho, Akashi 673-8688, JapanTelephone : 078(918)556655675568

Telefax : 078(918)5552

Pressure Resistent-Gravimetric Feeder

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