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Questions and Answers
What action is taken to secure the turntable in a fixed position during the propelling of the machine?
What action is taken to secure the turntable in a fixed position during the propelling of the machine?
- Engaging the propel clutch
- Disengaging the swing clutch
- Actuating the jaw clutches
- Applying the swing brake (correct)
What mechanism is used to deliver power to the driving sprocket in the crawler mechanism?
What mechanism is used to deliver power to the driving sprocket in the crawler mechanism?
- Hydraulic pump
- Chain drive
- Bevel gears and jaw clutches (correct)
- Pulley system
How does the electromagnetic design actuation of clutches improve shovel mechanism performance?
How does the electromagnetic design actuation of clutches improve shovel mechanism performance?
- Reduces maintenance complexity (correct)
- Allows simultaneous clutch engagement
- Increases power consumption
- Increases the swing time
Which clutch is engaged to reverse the direction of travel of the machine?
Which clutch is engaged to reverse the direction of travel of the machine?
What is the purpose of not allowing simultaneous engagement of the swing and propel mechanisms?
What is the purpose of not allowing simultaneous engagement of the swing and propel mechanisms?
In what situation are both jaw clutches L and R actuated?
In what situation are both jaw clutches L and R actuated?
Which feature of the swing and propel mechanism actuation enhances equipment stability?
Which feature of the swing and propel mechanism actuation enhances equipment stability?
Which design uses compressed air for clutch actuation?
Which design uses compressed air for clutch actuation?
What mechanism supports the dipper stick while allowing it to move forward and backward?
What mechanism supports the dipper stick while allowing it to move forward and backward?
Which component is responsible for pivoting the boom of a shovel?
Which component is responsible for pivoting the boom of a shovel?
What was a significant characteristic of the first shovels introduced in 1835?
What was a significant characteristic of the first shovels introduced in 1835?
Which part of the shovel is rigidly attached to the dipper stick?
Which part of the shovel is rigidly attached to the dipper stick?
What advancement allowed shovels to move off rail tracks?
What advancement allowed shovels to move off rail tracks?
Which component is primarily used to control the elevation of the boom?
Which component is primarily used to control the elevation of the boom?
How did the design of shovels evolve in terms of strength and weight?
How did the design of shovels evolve in terms of strength and weight?
The supporting structure that holds the pinions in position on a shovel is known as what?
The supporting structure that holds the pinions in position on a shovel is known as what?
What is the primary role of the superstructure on a turntable excavator?
What is the primary role of the superstructure on a turntable excavator?
Which type of shovel utilizes a piston-cylinder arrangement for controlling attachments?
Which type of shovel utilizes a piston-cylinder arrangement for controlling attachments?
What distinguishes a quarry mine type shovel from a commercial type shovel?
What distinguishes a quarry mine type shovel from a commercial type shovel?
Which component of a diesel shovel is responsible for the machine's propulsion?
Which component of a diesel shovel is responsible for the machine's propulsion?
What does the power transmission system of a diesel shovel include?
What does the power transmission system of a diesel shovel include?
Which classification of shovels is characterized by bucket capacities of 15.0 cu m to 75 cu m or more?
Which classification of shovels is characterized by bucket capacities of 15.0 cu m to 75 cu m or more?
Why is maintenance critical for the shovel mechanisms?
Why is maintenance critical for the shovel mechanisms?
Which mechanism allows a rope shovel to control front attachments?
Which mechanism allows a rope shovel to control front attachments?
Study Notes
Securing the Turntable
- The turntable is secured in a fixed position during propelling by a locking mechanism.
Power Delivery to Driving Sprocket
- The crawler mechanism utilizes a chain drive to deliver power to the driving sprocket.
Electromagnetic Clutch Actuation
- Electromagnetic clutches improve shovel performance by providing faster and more precise engagement and disengagement, compared to mechanical clutches.
Reverse Travel Clutch
- The reverse clutch is engaged to reverse the direction of travel.
Simultaneous Engagement Prevention
- Simultaneous engagement of the swing and propel mechanisms is prevented to maintain stability and prevent damage to the machine.
Jaw Clutch Actuation
- Both jaw clutches (L & R) are actuated when the machine is traveling straight or turning at slow speeds.
Enhanced Equipment Stability
- Independent actuation of the swing and propel mechanisms enhances equipment stability.
Air Actuation
- Pneumatic clutches utilize compressed air for clutch actuation.
Dipper Stick Support
- The dipper stick is supported by a telescopic boom mechanism, allowing for forward and backward movement.
Boom Pivoting Component
- The boom is pivoted by a boom pivoting mechanism.
Early Shovel Characteristic
- Shovels introduced in 1835 were rail-mounted.
Dipper Stick Attachment
- The bucket is rigidly attached to the dipper stick.
Shovel Mobility Advancement
- The introduction of crawler tracks allowed shovels to move off rail tracks.
Boom Elevation Control
- The boom elevation is primarily controlled by the boom hoist system.
Shovel Weight and Strength Evolution
- Shovels have evolved in design with increased strength and weight, allowing for handling heavier loads.
Supporting Structure for Pinions
- The supporting structure that holds the pinions in position is called the pinion carrier.
Superstructure Role
- The superstructure on a turntable excavator houses the engine, hydraulic system, rotating platform, and operator's cab.
Piston-Cylinder Actuation
- Hydraulic shovels utilize a piston-cylinder arrangement for controlling attachments.
Quarry Mine vs. Commercial Shovel Distinction
- Quarry mine shovels are designed for large-scale mining operations, featuring larger bucket capacities than commercial shovels, which are used in construction projects.
Diesel Shovel Propulsion
- The propulsion system of a diesel shovel is powered by the diesel engine.
Diesel Shovel Power Transmission System
- The diesel shovel's power transmission system includes the engine, transmission, final drive, and crawler tracks.
Large-Scale Shovels
- Large-scale shovels are characterized by bucket capacities of 15.0 cu m to 75 cu m or more.
Maintenance Importance
- Regular maintenance is critical for shovel mechanisms to ensure peak performance, safety, and longevity.
Rope Shovel Attachment Control
- Rope shovels utilize a rope system for controlling front attachments.
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Description
Explore the evolution and mechanics of shovels, from their steam-powered beginnings in 1835 to modern designs using crawler tracks. This quiz covers the key structural components including the head, legs, and arms, providing a detailed understanding of how shovels operate in construction contexts.
