DROP BALL Operation

8/13/2019 DROP BALL Operation

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Drop all Operation


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Drop all OperationCrushing of Boulders by Means

of Drop Ball Operation

COSTS

One machine only is required for loading and crushing of boulders

Lower capital expenditure in comparison to hydraulic hammer

Hammer operation either requires time for change of attachment or a second machine

Crushing by blasting requires high expenditure of work

FLEXIBILITY

Flexible organization of work. Boulders can be crushed immediately or else sorted out

and crushed later

NOISE

Lower noise level when crushing, compared to hydraulic hammer and blasting

SAFETY

Advantage in safety, if compared with blasting


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Preconditions for Drop-Ball Operation:

Drop-ball application requires some minor adaptations (safety devices/strengthening) to the hydraulic

shovel, but these can be done easily not only on new machines but also as retrofitting on older units.

Safety Devices:

During Drop-ball operation there is the risk of chips splitting off.Therefore, the operator as well as particularly vulnerable

shovel components have to be protected.

The following safety devices are recommended:

1) Cab protection

Chip guard, motor-driven / stationary front protection

2) Rod guards for hydraulic cylinders

3) Protections for swing gear and auto lube systems

Drop all OperationCrushing of Boulders by Drop Ball Operation


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Aiming at a target boulder

The drop ball is being grasped in the front

shovel bucket and - with the backwall in an

almost vertical position - it is raised above

the target boulder to be crushed. The

operator releases the ball by opening the

clam.

Technique to be applied

Time saving operation

An experienced operator always keeps the drop ball near

the hydraulic shovel. Ideally, he will make use of waiting

times during truck spotting to crush boulders sorted out

previously, thus avoiding boulders to accumulate in the

working area.



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Safety Devices

Protections for swing gear and lube system

Rod guards for hydraulic cylinders

The swing motor and the grease drum of the central

lube system and automatic pinion-lubrication system

located in front of the motor are protected against chipsby cover plates.

Cover plates effectively protect the piston rods of boom

and stick cylinders against damage.


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Safety Devices - Cab Protection

Chip Guard, motor-driven (1)

This chip guard consists of a steel net stretched

out in front of the cab window by means of a

motor-driven tow line during drop-ball operation.

Advantage: Unobstructed view during normal operation



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For drop-ball operation, the bucket has to be strengthened,

to compensate for the increased load on the clam when it

grasps the drop ball.

For this purpose, reinforcements (5) are incorporated not

only in the bucket clam but also in the backwall.

Strengthening of bucket for drop-ball operation

It is essential for drop-ball operation that the clam grasps the

ball where its circumference is largest. Under no

circumstances, the ball should be simply placed in the bucket,

since if it freely rolls around in it may cause considerable

damage.


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SKZALLG_44

Drop all OperationUndercarriage Bumper on Idler Side


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Drop all OperationRecommended Machine Preparation for

Drop Ball Operation with Front Shovel

Protection Part Recommended

Cylinder Boom X

Stick X

Cab Front Window X

Shot Proof Window X

Roller Bearing Steel Guard X

Swing Gear Lube System (barrels) X

Bucket Strengthen of Clam X

Strengthen of Back Wall X

Wear Strips X

Undercarriage Steel Structure X

DROP BALL Operation

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