CLAM-SHELL BUCKETS &

TRACTORS

BY...... P.SHARMEESH FINAL YEAR CIVIL DEPT.

The clam-shell bucket is a sophisticated articulating two-piece bucket mechanically hinged at the middle to form a claw-like appendage with an internal volume.

What is clam-shell bucket?

It is attached by a hangar or bracket and uses ground engaging tool on its cutting edge to dig in a vertical direction.

Clam-shell buckets are commonly used in dredging, excavation or material handling.

However, each application has its unique requirements and has to be designed optimally for maximum efficiency.

The design, develop and manufacture both hydraulic and mechanical clam-shell used on excavators and cranes.

How it is designed?

Why these Clam-shell buckets are designed? (Features)

Designed for durability for all material loading needs in field of work towards higher productivity.

Specially designed tooth point are equipped on the cutting edge to provide higher strength and longer life.

• Hydraulic rotation and knock-around manual rotation is available.

Classification of Clam-shell buckets :

This classification is done mainly based on the operating method And purpose of using.

Hydraulic Clam-shell bucket

Mechanical/cable Clam-shell bucket

Hydraulic Clam-shell for Telescopic Arm

Hydraulic Clam-shell : The Hydraulic clam-shell bucket is designed to be attached onto

an excavator. The dual or quad hydraulic cylinders/rams mounted on the outer rim of the bucket provide excellent digging force. The inner side of the bucket has a smooth surface for easy

unloading of high viscosity material such as mud and clay, while the outer layer is reinforced with additional layer of wear strips. The bowl's radius has been optimized to match with the locus of

the hydraulic cylinder/ram to deliver consistently full load for maximum productivity. Hydraulic designs are meant for attaching to an excavator while the mechanical cable operated are designed to work with a broad range of cranes. The buckets are constructed with high tensile steel and wear

resistant steel with capacity starting from 1 cubic meter and upwards.

Mechanical/Cable Clam-shell :

The fully mechanical clam-shell is designed specifically to be used on a crane for large capacity dredging and digging applications.The opening and closing action is operated via cable.The inner side of the bucket has a smooth surface for easy unloading of high viscosity material such as mud and clay, while the outer layer is reinforced with additional layer of wear strips.The hanger is constructed with high tensile steel. The design concept and criteria of a dredging versus a general purpose loading/unloading mechanical/cable clam-shell differs greatly due to its differences in the nature of application and working condition.The geometry and weight distribution of a good clam-shell design play a significant role in determining its overall efficiency.

Hydraulic Clam-shell for Telescopic Arm :

Telescopic dipper arms are gaining popularity where dipexcavation work needs to be carried out in tightly spacedenvironment. The single centered mount hydraulic cylinder/ram clam-shellbucket is specifically designed to be used on a telescopic dipperarm.The unique and powerful customized hydraulic cylinder/ramdelivers smooth opening and closing actions with strong penetration force which is a prerequisite for an effectiveTelescopic clam-shell bucket.

• Digging pits for ground construction work.

• Ideal for digging and loading material in tight and limited spaces.

• Material handling, loading and unloading industrial wastes, grains, sands, etc.

• Heavy duty mechanical clam-shell is ideal for dredging application by crane.

Applications:

Tractors

Multipurpose machines used mainly for pulling and other equipment.

Tractors may be classified as: a) Crawler type tractor b) Wheel type tractor Crawler Type Tractor : These are used to move bulldozers, scrapers.The crawler has a chain by which these tractors can be very effectively even in the cases of loose or muddy soils.The speed of this type does not exceed 12 kmph normally.

Tractors used in construction :

Loader backhoe tractorCaterpillar equipment tractorRoad construction tractorBack push tractorCaterpillar compaction tractorScraper tractors

Wheel Type Tractor :In these type the engine is mounted on four wheels.The main advantage is higher speed, Sometimes exceeding 50 kmph. It is used for long-distances hauling and good roads.

Crawler Type Slow speed More compact, powerful and can

handle heavier jobs Costly Cost of operational & maintenance

is high Stick control for steering Moves on rough roads only Used for short distances Requires skillful operation,

maintenance and repairs

Wheel TypeGreater speed

Can handle only lighter jobs

Cheaper

Operational & maintenance cost is less

Wheel steering control

Moves on rough as well as good roads

Used for longer distances

Lesser skills required for operations, maintenance and repairs

Comparison

ANY QUESTIONS ?

THANK YOU