This is important for the aspirants of TECH III in LDCE Exams in SR Railways.
Topic Name :-
Machine Type :- BCM (Balast Cleaning Machine)
Maximum Speed:- Self Propelled 40KMPH
In Train Formation 40KMPH
Model use on various Track:-
On Plan track BCM :- RM-80 KBC-600
On P&C :- RM-76
Progress Rate:-
RM-80 : 650 cube metter
RM-76 : 550 cube metter
KBC-600 : 650 cube metter
No of Engine : 02
Firing Order : 1-8-5-10-3-7-6-11-2-9-4-12
No of cylinder : 12
Cooling Type : Air cooled
Capacity(BHP) : 453@2300 RPM
Also read : DUTY OF TECH III , PRE BLOC WORK , ABOUT CSM
The chassis has study welded construction. The frame and other units are joined by welding. The machine is equipped with buffers and draw bar on either end.
There are two powered bogies, each having two power axle. The powered axles of both bogies are driven by a hydraulic motor through a gear and a hydraulic multiple disc clutch. In working mode, the speed is variable from 0 to 1000 meter/hr. There is a working and driving cabin at the front end of the machine having all controls necessary for travel and work. this cabin is located right in front of the cutter bar which gives the operator a good view not only of controls and panels but also of the working units.
The machine is equipped with a pneumatic block brake acting on all powered wheels. There is hand operated braking valve for direct pneumatic braking. The machine also has a through brake pipeline to facilitate movement in train formation.
There is a 24V DC plant for lights, battery charging, electric control and monitoring systems of the diesel engines. and flood lights during night working.
For excavating the ballast, there is endless scraper chain located between the bogies and running under the track when working. The chain is basically composed of scraper blades with fingers, intermediate links and bolts.
Chain speed is variable between 2.4 to 4.0 metres per second.
The excavation chain is guided in two slanted lateral channels and one horizontal channel. The top of the lateral guides are pivoted to the machine frame and hydraulically adjusted. The lower part of the chain guide is parallel to the machine body and is made of wear resistant steel. For protection against dust, noise and for safety reasons, the lateral guides are covered with solid rubber sheets which open by hinges.
At the beginning of work at a site, the cutter bar is inserted underneath the sleepers and connected to the lateral guides by quick action locks. Hydraulic hoists are provided for easy handling of the cutter bar. At the end of the work at a particular site, the cutter bar is removed.
The screening unit consists of three vibrating sieves of the following square mesh sizes:
The distributing conveyors receive the cleaned ballast and distribute it evenly across the entire surface of track right behind the excavating chain.
From underneath the screening unit, the waste drops to the conveyor belt which carries it to a hydraulically adjustable belt controlled from the cabin. The waste can be discharged outside the track by means of the tilting waste conveyor.
A track lifting and slewing unit is located next to the cutter bar for adjusting the excavation depth and for avoiding the obstacles.
Topic Name :-
A Brieff note about BCM Machine.
Machine Catagery:- Balast Handling.Machine Type :- BCM (Balast Cleaning Machine)
Model No :-
BCM
RM-80
RM-76
KBC-600
Number of Wheals used :- 8Maximum Speed:- Self Propelled 40KMPH
In Train Formation 40KMPH
Model use on various Track:-
On Plan track BCM :- RM-80 KBC-600
On P&C :- RM-76
Progress Rate:-
RM-80 : 650 cube metter
RM-76 : 550 cube metter
KBC-600 : 650 cube metter
Engine Used :
Model No :- Deutz-BF 12L 513CNo of Engine : 02
Firing Order : 1-8-5-10-3-7-6-11-2-9-4-12
No of cylinder : 12
Cooling Type : Air cooled
Capacity(BHP) : 453@2300 RPM
Also read : DUTY OF TECH III , PRE BLOC WORK , ABOUT CSM
Basic Units :
- Excavating Unit
- Screening Unit
- Conveyer system for distribution of ballast and disposal of muck
- Track lifting and slewing Unit.
- Recording unit.
Description of Machine:
The machine is powered by two independent power units (Total engine out put : 666kw) with air cooled Deutz Diesel engines type BF-12L 513C which drive the pump distribution gears via cordon shafts. The front engine powers the hydraulic pumps forall conveyor belt drives,both is working and travelling mode. The rear engine provides power for hydraulic pumps for the excavation chain drive and the screen drive and also powers the hydraulic propulsion for travelling.
lifting movements and
the hydraulic propulsion,
The chassis has study welded construction. The frame and other units are joined by welding. The machine is equipped with buffers and draw bar on either end.
About Bogies
There are two powered bogies, each having two power axle. The powered axles of both bogies are driven by a hydraulic motor through a gear and a hydraulic multiple disc clutch. In working mode, the speed is variable from 0 to 1000 meter/hr. There is a working and driving cabin at the front end of the machine having all controls necessary for travel and work. this cabin is located right in front of the cutter bar which gives the operator a good view not only of controls and panels but also of the working units.
Braking system
The machine is equipped with a pneumatic block brake acting on all powered wheels. There is hand operated braking valve for direct pneumatic braking. The machine also has a through brake pipeline to facilitate movement in train formation.
Battery
There is a 24V DC plant for lights, battery charging, electric control and monitoring systems of the diesel engines. and flood lights during night working.
Purpose of the using the Chain in BCM
For excavating the ballast, there is endless scraper chain located between the bogies and running under the track when working. The chain is basically composed of scraper blades with fingers, intermediate links and bolts.
Chain speed is variable between 2.4 to 4.0 metres per second.
The excavation chain is guided in two slanted lateral channels and one horizontal channel. The top of the lateral guides are pivoted to the machine frame and hydraulically adjusted. The lower part of the chain guide is parallel to the machine body and is made of wear resistant steel. For protection against dust, noise and for safety reasons, the lateral guides are covered with solid rubber sheets which open by hinges.
At the beginning of work at a site, the cutter bar is inserted underneath the sleepers and connected to the lateral guides by quick action locks. Hydraulic hoists are provided for easy handling of the cutter bar. At the end of the work at a particular site, the cutter bar is removed.
Screening unit of BCM MACHINE
The screening unit consists of three vibrating sieves of the following square mesh sizes:
Upper screen :80mmThe vibrations are provided by hydraulically driven rotating fly weights. In super-elevated curves, the entire unit is hydraulically adjusted by the operator to keep it horizontal.
Middle screen :50mm
Lower screen : 36mm
The distributing conveyors receive the cleaned ballast and distribute it evenly across the entire surface of track right behind the excavating chain.
Waste dropping system
From underneath the screening unit, the waste drops to the conveyor belt which carries it to a hydraulically adjustable belt controlled from the cabin. The waste can be discharged outside the track by means of the tilting waste conveyor.
Track lifting Unit
A track lifting and slewing unit is located next to the cutter bar for adjusting the excavation depth and for avoiding the obstacles.
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