PARTS OF TAMPING UNIT

TAMPING UNIT

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Main parts of a Tamping Unit

ABOUT TAMPING TOOLS

Main Parts of A Tamping Unit are as follow:-

1. Vibration Shaft
2. Fly Wheel Cover
3. Vibration Shaft Main Bearing Oil Reservoir
4. Tamping Arm Bearing Oil Reservoir
5. Filling Point Vibration Shaft Bearing
6. Big squeezing cylinder
7. Big Tamping Arm
8. Small Tamping Arm
9. Clapper cylinder
10. Hydraulic Distributer
11. Tamping Bank/Main Frame
12. Small squeezing cylinder

Read More:- 

         Duty of TECH III

         PRE BLOCK WORK

         ABOUT BCM
         Maintenance Schedule

The two high pressure tamping units work according to the non-synchronous uniform pressure tamping principle. Force equilibrium between the tamping tools, directioinal vibration in the squeeze direction and the ideal vibration frequency of 35Hz gives completely uniform tamping. For work in curves, the unit can be centred automatically over each rail. During each cycle, two sleepers can be tamped with the help of 32 tamping tools.

A brief discription of vaious pars of Tamping Unit

 A brieff desciption of various parts of Tamping Unit is given below.

1. Tamping Bank:-  Tamping Bank is the Main Frame of tamping unit on which all the other parts are assembled. It requires two numbers per machine for CSM machine.
2. Tamping Arms;- There are four Amall and four Big tamping arms are present in a tamping unit. These are connected with Big and Small squeezing cylinders respecively.
3. Vibration Shaft and its Accessories:-  Vibration Shaft is an eccentric Shaft. It is  used to generate required vibrations to help in tamping tool penetration in the ballast. Vibration Shaft is fixed in taming bank; squeeing cylinders are mounted on vibration Shaft.
4. Guide Rods:-  Through Guide Rod tamping unit is connected with the machine and it guide the tamping unit during UP/DOWN movement.
5. Small Squeezing Cylinders:- Small Squeezing Cylinders are connected with small arm is used to squeeze the ballast in addition to that it transfers vibration from vibration shaft to the tools. A pair of male and female small cylinders is present in a unit.
6. Big Squeezing Cylinders:- Big squeezing cylinders are connected with Big Arm is used to squeeze the ballast in addition to that it will transfer vibraition from vibration shaft to the tool. A pair of male and female big cylinders present in unit.
7. Fly Wheel Motor Side:- Fly wheel is used to store energy. It is connected with vibration motor using part clutch.
8. Flywheel outer Side:- It is fitted opposite to motor side. It is used to store enegry.
9. Cover Guard Outer:- It is used to cover the outside fly whel and Also as oil Resevoir for the librication of centre arm pin assembly and main bering. Each reservior has one oil level gauge and one breather assembly.
10. Plate Guard:- It holds the vibration motor in perfect alignment and covers the flywheel in motor side.
11. Vibration Motor:-  Vibration Motor is used to rotate vibration shaft at 2100 rpm with 150 kg/sq. cm hydraulic pressure, it converts hydraulic enegy into mechanical energy.
12. Hydraulic Distributor:- It distributes the pressurized hydraulic oil and supplies to squeeze.
13. Bearings:-  Bearings are used on vibration shaft for easy rotation 10 roller bearings & 1 ball bearing is used in CSM T/U. 
14. 35 MM Pin:- it is used to connect squezing cylinders with tampijng arm; it is fitted in taming arm after proper cooling in freezer requires 12 per unit. It moves with tamping are while vibration/ squeezing.
15. 55 MM Pin:- It is used to hold tamping arm, it is fitted in taming arm after proer cooling in freezer at proper interferefnce requires 8 per unit, it moves with tamping arm while vibtating/squeezing.
16. Bronze Bushes:- 

• Bushes for Centre Arm Pin:- These are used for centre arm pin bush movement 16 fbushes are required per unit. It is made by centrifugal casting method. It is pressed in main frame of tamping unit to hold tamping arm.
• Bushes for Guide Column:- These bushes are used in tamping unit guide rod bore for free movement of tamping unit in up down movement. It requires 4 per unit.

TAMPING TOOLS

1. Tamping Tool:- Tamping tools are the final performers of tamping machine during tamping. That's why quantity of tools and shape of tools are considered very important for the quality  of pacing. Wear of tamping tool blade is permitted only up to 20% of blade areas More than 20% worn out tools need replacement for proper quality of packing of ballast under sleeper.

• According to Material:

1. Forged Steel Tool With Hardness of 280 BHN:- Forged Steel Tamping Tools wear and tear at blade portion becomes more and it reduces the blade size. It needs re-welding to maintain the proper size of blade after 10-15 km working.
2. Tungsten Carbide Tip Tool (TCTT):- TCTT Type Tamping Tools has long life. It gives approx. 250 km life without any maintenance. In these tools, at the location of squeezing face Tungsten Carbide Tips are Welded.

• According to Design:

1. Taper Shank:- This is the old version of Tools, in this tool head of the tool has a tapered shape. This is used on old CSMs
2. Parallel Shank:- This is the new version of tools, in this tool head of the Tool does not have a tapered shape. This is used on new CSMs.

• According to Size of Blade: 

1. Full Tool:-   These tools have Tool Blade of Size 140 x 70 mm. These tools are used normally far side of rail head.
2. Half Tools:-  These Tools are used near side of rail head. Due to fear of infringement with rail length of blade is chosen less than 140 mm. Width of blade is same as Full Tools.