Hoist Systems and Controls Quiz

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Questions and Answers

What is a key safety feature required in the control setup described?

Emergency stop buttons (correct)

Regular maintenance schedule

Remote operation capability

Automated control system

Which type of runway is most commonly supported by existing building structures?

Suspended runways

Special track systems

Simply supported runways (correct)

Free standing runways

What is the primary characteristic of special track systems for light crane profiles?

They are versatile and can be assembled in various configurations. (correct)

They require heavy-duty building structures for support.

They are only available in fixed lengths.

They can only be used for low capacity operations.

What type of runway is used when no existing supports are available?

Free standing runways Signup and view all the answers

Which type of runway might be suspended from roof members?

Suspended runways Signup and view all the answers

What is a characteristic of free-standing jibs in terms of their design?

They can have a full 360° angle of slew with a tubular column. Signup and view all the answers

Which statement about mobile gantries is accurate?

They consist of a runway beam and two supports in a goalpost-like configuration. Signup and view all the answers

What is a limitation of the goalpost gantry design?

It is limited to light loads of up to 500kg. Signup and view all the answers

Which factor influences the design of the supporting column for the jib arm?

The intended use and angle of slew. Signup and view all the answers

What type of structure is a mobile gantry primarily designed for?

Non-permanent installations that require relocation. Signup and view all the answers

What does a hydraulic motor convert into torque or rotation?

Hydraulic pressure and flows Signup and view all the answers

What is a significant advantage of using a hydraulic motor?

It operates effectively in noise-sensitive environments. Signup and view all the answers

Which control option is beneficial for areas inaccessible for direct operation?

Radio or infrared controls Signup and view all the answers

What is the purpose of multi-point controls in hoist operations?

To enable control from various positions Signup and view all the answers

What precaution must be taken with multi-point controls?

They must be interlocked to prevent simultaneous operation. Signup and view all the answers

What type of bridge crane combines features from both top running and portal bridge cranes?

Semi-Portal Bridge Crane Signup and view all the answers

Which of the following is NOT listed as an advantage of using a light crane system?

Increased energy consumption Signup and view all the answers

What construction feature is emphasized to reduce stress on support structures in light crane systems?

Pendulum construction Signup and view all the answers

What type of hoist is typically used with a single bridge version of a light crane system?

Manual chain hoist Signup and view all the answers

What facilitates the modifications and extensions of installations in light crane systems?

Modular design Signup and view all the answers

What is the primary purpose of tower cranes on construction sites?

To lift building materials and waste Signup and view all the answers

What defines an offshore pedestal crane?

It is pedestal-mounted and rotates for lifting materials to marine vessels. Signup and view all the answers

Which advantage does a truck-mounted lifting device provide?

It allows precise delivery of goods without needing separate cranes. Signup and view all the answers

What is a common usage for the outreach of a tower crane?

To reach across to multiple construction areas Signup and view all the answers

Which materials are typically lifted using tower cranes?

Building materials such as steel and concrete Signup and view all the answers

Study Notes

Hydraulic Motors

Hydraulic motors convert hydraulic pressure and flows into torque, or rotation, which moves the hoist.
They are virtually noiseless because the electric motor doesn't have to be located near the fluid drive.
Commonly found in intrinsically safe areas like pneumatic hoists.

Electrical Controls

Radio or infra-red controls allow for remote or central control.
Useful in areas that are difficult to access directly.
Multi-point controls allow for hoist operation from multiple locations.
These arrangements have interlocks to prevent multiple control operations simultaneously.
Emergency stop buttons override all control positions and must be manually reset.

Supporting Structures for Hoists and Light Crane Systems

Built-in Runways are supported by existing building structures.
Suspended Runways are hung from roof members or beams.
Free-standing Runways are used when no suitable supports are available.
Special track systems (Light Crane Profiles) are versatile and come in kits for various configurations, including simple runways, switches, and turntables.

Free Standing Jib Cranes

The jib arm and supporting column are assembled as a single unit.
They can be over-braced or underbraced depending on their intended use.
The supporting column is made from a square box section, fabricated sections, or tubes depending on the slewing angle.
They can have a 360° or 270° slewing angle.

Mobile Gantries

Useful for areas where permanent installation would be expensive.
They consist of a runway beam and two supports or A-frames in a goalpost configuration.
The supports are usually mounted on wheels or castors.
They can be dismantled and transported.

Goalpost Gantries

Have a runway beam often made with a manufacturer's track section.
Use a single column support for stability.
Limited to light loads (up to 500kg).

Semi-Portal Bridge Cranes

A combination of a top running bridge crane and a portal bridge crane.
The bridge design can have a cantilever at the end of the span supported by legs.

Light Crane Systems

Modular in design, consisting of lifting devices, bridges, trolleys, and tracks for lifting operations.
Advantages include smooth travelling movements, silent running, less wear and pollution, modularity, pendulum construction (reduced stress on support structure), easy installation, easy modification, and reduced maintenance.
Two parallel tracks are suspended from the ceiling with a single or dual-bridge crane running between them.
Single bridge cranes are typically manual push/pull and use a manual or electric chain hoist.
Dual bridge cranes have a trolley suspended between bridges for an electric chain hoist.
Easy to adapt and extend for changing needs.
Used to lift goods on and off trucks to eliminate the need for forklifts.

Tower Cranes

Common at construction sites.
Can reach hundreds of feet into the air.
Used to lift building materials like steel, concrete, waste skips, and generators.

Offshore Pedestal Cranes

Pedestal-mounted, elevating, and rotating lifting devices.
Transfer materials and personnel to or from marine vessels, barges, and structures.
Standardized design for offshore cranes.

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Description

Test your knowledge on hydraulic motors, electrical controls, and supporting structures for hoists and light crane systems. This quiz covers essential concepts related to the operation and safety features of these systems. Prepare to enhance your understanding of hoist technology.