Crane Lifting Structure: The Comprehensive FAQ Guide

The crane lifting structure serves as an essential working mechanism for lifting machinery. It relies on the power system to drive the hoisting structure, allowing the hook to raise and lower goods at a specific speed and maintain them at a certain height.

Understanding this crucial lifting structure is vital, as it directly impacts the crane’s safe working load (SWL). As a professional marine crane manufacturer, OUCO is here to guide you through a comprehensive understanding of various aspects related to the lifting structure.

What is the composition of the lifting structure of a crane?

The lifting structure of a crane consists of a boom, hoisting winch, a pick-up device, wire rope, a guide pulley, a pulley set, and the safety protection device.

What parameters are required for the design of the crane lifting structure?

Lifting capacity, lifting height, lifting speed, working level, crane conditions of use and other special requirements.

What are the pick-up devices?

Pick-up devices include hooks, grab buckets, crane electromagnetic chuck, and container spreaders.

What is the structure of the lifting hydraulic winch?

Engine, reducer, reel, brake, valve block, end support, hydraulic motor, rope presser, rope discharger.

How to distinguish the winch?

Winches can be distinguished based on various factors:

• By the method of use: Manual winches, Electric winches, Pneumatic winches, Hydraulic winches.
• Based on the form of the reel: Single reel and Double reel.
• According to the distribution form: Parallel wire reels and Front & Rear Double Drag reels.

What do I need to consider when choosing a crane wire rope?

When choosing a wire rope for your crane, it is essential to assess the following factors:

1. Ensure the load, diameter, and length are suitable for your crane’s requirements.
2. Prioritize the safety of the lifting structure.
3. Verify if the crane’s performance efficiency is adequately met.
4. Consider how it might affect the crane and winch’s service life.
5. Take measures to avoid wire rope tangles during operation.

How to maintain the winch wire rope?

1. Minimize the change of wire rope winding direction to avoid excessive bending.
2. Ensure the wire rope traction direction aligns with the sheave-groove for reduced friction on the groove wall.
3. Utilize pulleys and reels with lower hardness to minimize wear on the wire rope.
4. Regularly perform maintenance and lubrication on the wire rope to reduce friction during operation.

How to maintain the crane wire rope?

To ensure the longevity and safety of the crane wire rope, follow these maintenance steps:

1. Operate within the temperature limits specified for the wire rope. For special working environments, consider using wire ropes with a steel core or special alloy composition.
2. Avoid irregular winding during lifting operations to minimize wire rope extrusion, deformation, vibration, and corrosion.
3. Regularly inspect the wire rope’s fixings and connections to ensure they are secure.
4. Add lubricant to the wire rope at regular intervals to enhance its performance.
5. Keep the wire rope clean by removing gravel and dust regularly.

What is a wire rope reel?

The reel is used to wind the wire rope, it can control the winding and releasing of the wire rope, the reel is also divided into slotted reel and non-slotted reel.

The winch reel equipped by OUCO for the crane is a slotted reel, slotted reel can better control the winding of the wire rope, so that it is neatly arranged to avoid friction and winding.

What is a crane hook?

A crane hook serves as a commonly utilized lifting device integrated into cranes, pulley systems, or other lifting mechanisms. Its purpose is to connect and secure cargo, enabling efficient movement and lifting operations.

Hooks can be categorized as single hooks and double hooks, typically manufactured from high-quality carbon steel. Additionally, there are specialized hooks like Eye Hooks or Clevis Hooks.

Single hooks are ideal for lifting small to medium-weight loads, while double hooks are designed to handle heavier loads.

What is the material of the hook?

The hooks of cranes are typically crafted from high-quality carbon steel, alloy steel, or special materials like DG20Mn and DG34CrMo.

These materials are strong and durable, ensuring the reliability of the hook in heavy lifting operations.

What is a guide pulley?

A guide pulley is a crucial component used to direct the movement of the wire rope or nylon rope. The guide pulley’s design is essential for preventing wire rope misalignment and excessive friction.

With its pulley structure, it not only guides the direction of the rope during crane lifting operations but also plays a role in energy conservation.

What is a pulley set?

A pulley set consists of multiple fixed and dynamic pulleys, working in unison to save force and alter the direction of force during crane operation.

This ingenious arrangement allows the crane to lift heavy loads with reduced effort, increasing overall lifting efficiency and minimizing strain on the equipment.

What is the safety protection device of the lifting structure?

The safety protection device of the hoisting structure serves to limit the length of the wire rope, ensuring it remains within a safe and appropriate range. Often installed on the wire rope reel, it incorporates upper and lower limiters for added safety.

This safety feature is essential for preventing wire rope overextension, safeguarding both the crane and the cargo during lifting operations.

Wrap Up

We hope that the above-mentioned frequently asked questions about crane lifting structures, provided by OUCO, have addressed your inquiries comprehensively.

Our team is dedicated to delivering top-notch MARINE SOLUTIONS and PORT SOLUTIONS, featuring marine cranes and harbor cranes equipped with high-quality lifting structures that align perfectly with your specific requirements.

Don’t hesitate to reach out to us today! Let OUCO be your trusted partner in fulfilling your lifting needs. Contact us now!

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