In the dynamic landscape of construction, shipbuilding, and material handling, the level luffing crane stands out as a pivotal piece of equipment, particularly in China, where industrial growth and infrastructure development are rampant. This specialized crane, known for its ability to maintain the hook at a constant height while the jib is raised or lowered, is a game-changer in sectors such as ports, shipyards, and metallurgical works.

Our in-depth guide delves into the world of level luffing cranes in China, providing a comprehensive overview of their technical specifications, operational advantages, and diverse applications. Readers will gain insights into the various types of level luffing cranes, including fixed and mobile designs, and the range of lifting tools they can be equipped with, such as grab buckets and container spreaders.

We will explore the key manufacturers in China, including Zoomlion, XCMG, and Sany, and discuss the importance of ensuring safety and quality standards when sourcing these cranes

level luffing crane Suppliers and Manufacturers China

Since the specific website you mentioned is not accessible in the provided search results, I will create a comprehensive guide based on the general information available about level luffing cranes from the other sources.

Level Luffing Crane Guide

Introduction

A level luffing crane is a specialized type of crane designed to maintain the hook at a constant level while the jib is moved up and down. This feature is crucial for precise load handling, particularly in environments such as construction sites, shipyards, and ports.

Key Characteristics

Mechanism

• The level luffing mechanism ensures the hook remains at the same level during jib movement. This is achieved through additional mechanical linkages or electronic controls that adjust the hoist cable[5].

Types of Level Luffing Mechanisms

• Toplis Cable Luffing: An early design using mechanical linkages and pulleys to compensate for jib movement.
• Horse-Head Jibs: Modern cranes use a “horse head” section at the top of the jib to maintain level through linked pivots.
• Powered Level-Luffing: Advanced systems use electronic controls and reversible motors to achieve precise positioning[5].

Technical Specifications

Lifting Capacity and Height

• Level luffing cranes can have lifting capacities ranging from 5 to 100 tons and lifting heights from 5 to 50 meters[1][2][4].

Working Range and Speed

• These cranes offer a large working range and can operate at various speeds. For example, lifting speeds can range from 0 to 20 meters per minute[1].
• The boom can be made up of single boom or four linked bars, allowing for stable and reliable operation[1].

Power Supply and Control

• Level luffing cranes typically use three-phase AC power supplies with voltages such as 220V, 380V, and frequencies like 50Hz[1][2][3].
• Control methods include cabin room control, pendent line control, and remote control[2].

Applications

Ports and Docks

• These cranes are extensively used in ports, docks, and bulk cargo terminals for handling shipping containers and heavy materials[2].

Shipbuilding and Construction

• Level luffing cranes are ideal for shipbuilding factories and construction sites where precise load movement near ground level is necessary[5].

Metallurgical Works

• They are also used in metallurgical works for handling heavy materials efficiently[2].

Environmental and Operational Conditions

Ambient Temperature and Humidity

• These cranes can operate in ambient temperatures ranging from -25°C to 40°C and relative humidity up to 95% at 40°C[2].

Wind Speed

• They can withstand wind speeds up to 20m/s during working hours and up to 42m/s during non-working hours[2].

Safety and Maintenance

Overload Limiters and Alarms

• Level luffing cranes often come equipped with overload limiters and audible and visual alarms for enhanced safety[2].

Maintenance and Warranty

• Manufacturers typically provide warranties (e.g., 3 years) and offer free distribution of wearing parts, technical support, and field installation services[1].

Customization and Special Designs

Customized Products

• Many manufacturers offer customized products to meet specific client demands, including special designs for unique applications[1].

Optional Configurations

• Optional configurations include different control ways (pendent line, cabin, remote), electrical parts from various brands (e.g., SCHNEIDER, SIEMENS), and special motor and reducer specifications[2].

Installation and Service

Installation Support

• Manufacturers often provide assembly videos, technical support, and field installation services to ensure smooth setup and operation[1].

After-Sales Service

• Comprehensive after-sales service includes localized warranty service, spare parts provision, and turnkey solutions from factory to disassembly[1][3].

By understanding these key aspects of level luffing cranes, users can make informed decisions about their application, maintenance, and customization needs.

Level Luffing Cranes – 11 Manufacturers, Traders & Suppliers

Level Luffing Cranes: An In-Depth Guide

Introduction

Level luffing cranes are specialized crane mechanisms designed to maintain the hook at a constant height while the jib is moved up and down. This feature is crucial in various industries, including construction, shipbuilding, and cargo handling, where precise and safe load movement is essential.

Key Characteristics

Hook Level Maintenance

The primary characteristic of a level luffing crane is its ability to keep the hook at the same level while the jib is luffed (moved up and down). This is achieved through additional mechanisms such as the “horse head” section or sophisticated control systems that adjust the hoist cable[2][3][5].

Jib Movement

The jib of a level luffing crane moves up and down to change the distance between the crane hook and the base of the crane. This movement allows the hook to be moved inwards and outwards relative to the crane’s base without changing its height[2][3][5].

Mechanisms and Technologies

Horse-Head Jibs

Modern level luffing cranes often incorporate a “horse head” section at the top of the jib. The interconnected action of the pivots in this section ensures that the hook remains level as the jib moves[2][3][5].

Powered Level-Luffing

Advanced cranes use electronic controls and reversible motors to adjust the hoist cable, maintaining the hook’s level with high precision. Earlier systems used mechanical clutches and hydraulic gearboxes, but modern systems offer greater accuracy and simplicity[1][2].

Toplis Cable Luffing

An early form of level-luffing gear, the “Toplis” design, involves a mechanical linkage that pays out extra cable to compensate for the jib’s movement, keeping the hook level. This system uses pulleys at the crane’s apex to manage the cable[1].

Operational Mechanisms

Traveling Mechanism

Level luffing cranes can move along rails or other flat surfaces, enhancing their mobility and operational flexibility[5].

Slewing Mechanism

These cranes can rotate around their vertical axis, allowing them to cover a wider operating range without needing to relocate the entire structure[5].

Luffing Mechanism

The luffing mechanism controls the up and down movement of the boom, adjusting the distance between the crane hook and the base of the boom[5].

Lifting Mechanism

The lifting mechanism controls the lifting and lowering of loads using cables and pulley systems[5].

Practical Applications

Shipbuilding

Level luffing cranes are essential in shipbuilding for precisely maneuvering large ship components, ensuring safety and efficiency throughout the construction process[3][5].

Cargo Handling

In ports, these cranes are used for loading and unloading containers and bulk cargo, facilitating seamless port operations[3][5].

Construction

In construction, level luffing cranes support the installation of building components with utmost precision, ensuring structural integrity and adherence to project timelines[2][5].

Advantages

High Accuracy

The ability to keep the crane hook at a constant height allows for careful movement of loads near ground level, which is particularly useful in construction and shipbuilding[2][3][5].

Wide Operational Range

With luffing and slewing capabilities, level luffing cranes can reach various positions without needing to move the entire equipment, making them highly versatile[5].

High Safety

These cranes minimize the risk of damage to goods or loads due to their excellent control over the height of the crane hook[5].

Space Efficiency

Level luffing cranes are particularly useful in urban construction sites where space is limited. They can operate within the site boundaries, avoiding the need for oversailing rights over neighboring buildings[2].

Disadvantages

High Cost

The design and manufacture of level-luffing cranes require advanced technology and significant expenses, making them more costly than other types of cranes[5].

Complex Maintenance

The complex structure and mechanisms of level luffing cranes necessitate meticulous and frequent maintenance procedures[5].

Load Limitations

Some types of level-luffing cranes have load limitations compared to other types of cranes, which can be a constraint in certain applications[5].

Modern Features and Safety

Advanced Control Systems

Modern level luffing cranes often feature advanced electronic controls, including encoders for overspeed safety and load measurement devices. These systems enhance the precision and safety of the crane operations[2].

Operator Comfort and Safety

Operator cabs are designed to be comfortable and easy to use, with features such as climate controls, flexible seating, and easy-to-read display screens. Additional safety features include anti-collision and zoning systems, as well as CCTV cameras[2].

Maintenance and Durability

Level luffing cranes are designed with low-maintenance architecture and use premium-quality parts that are proven to be high-quality and long-lasting for continuous heavy use[2].

In summary, level luffing cranes offer a unique combination of precision, safety, and versatility, making them invaluable in various industrial applications. Their advanced mechanisms and features ensure efficient and safe operations, despite the higher costs and maintenance requirements.

China LLC Level Luffing Crane Manufacturers, Suppliers

Level Luffing Crane (LLC) Guide

Overview

A Level Luffing Crane (LLC) is a specialized crane mechanism designed to keep the crane hook at a constant height while the boom is moved up and down. This feature is crucial for precise and safe load handling, particularly in industries such as shipbuilding, construction, and port cargo handling.

Key Components and Mechanisms

Traveling Mechanism

• The crane can move along pre-installed tracks or rails, allowing for precise and effortless repositioning.
• Some models are equipped with wheels for traversing flat surfaces, enhancing operational flexibility[1].

Slewing Mechanism

• Enables the crane to rotate 360 degrees around its vertical axis, expanding the operating range without the need to relocate the entire structure[1].

Luffing Mechanism

• Controls the up and down movement of the boom, adjusting the distance between the crane hook and the base of the boom. This mechanism ensures the hook remains at the same level during operation[2][3].

Lifting Mechanism

• Manages the lifting and lowering of loads using cables and pulley systems. Advanced systems may include electronic controls and reversible motors for precise positioning[2].

Specifications and Capabilities

Lifting Capacity

• LLC cranes can have varying lifting capacities:
• 35 tons (18-30 m of hook height)
• 16 tons (30-50 m of hook height)
• 5 tons (50-55 m of hook height)[4].

Lifting Height

• The lifting height can extend up to 35 meters above the rail surface and 12 meters below the rail surface[4].

Working Range

• The maximum range of the hook is 55 meters, with a minimum range of 18 meters[4].

Working Speeds

• Lifting Speed: 0.6-10 m/min (for 35 tons), 0.6-15 m/min (for 10 tons)
• Luffing Speed: 1-10 m/min
• Rotation Speed: 0-0.25 rpm (vertical motor with planetary reducer)
• Traveling Speed: 3-30 m/min (three in one drive)[4].

Practical Applications

Shipbuilding

• LLC cranes are essential for precisely maneuvering large ship components, ensuring safety and efficiency during the construction process[1].

Cargo Handling

• Widely used in ports for loading and unloading containers and bulk cargo, facilitating seamless port operations[1].

Construction

• Supports the installation of building components with utmost precision, ensuring structural integrity and adherence to project timelines[1].

Advantages

High Accuracy

• The ability to keep the crane hook at a constant height allows for careful movement of loads near ground level, which is particularly useful in shipbuilding and construction[1].

Wide Operational Range

• With luffing and slewing capabilities, the crane can reach various positions without needing to move the entire equipment[1].

High Safety

• Minimizes the risk of damage to goods or loads due to excellent control over the height of the crane hook[1].

Disadvantages

High Cost

• The design and manufacture of LLC cranes require advanced technology and significant expenses[1].

Complex Maintenance

• The complex structure and mechanisms necessitate meticulous and frequent maintenance procedures[1].

Load Limitations

• Some types of LLC cranes have load limitations compared to other types of cranes[1].

Advanced Mechanisms

Toplis Cable Luffing

• An early form of level-luffing gear that uses mechanical linkages and the reeving of hoist cables to keep the hook level[2].

Horse-Head Jibs

• Modern cranes often use an additional “horse head” section at the top of the jib to maintain the hook’s level through linked pivot actions[2].

Powered Level-Luffing

• Sophisticated systems use electronic controls and reversible motors to control the level of luffing directly, achieving high positioning accuracy[2].

Conclusion

Level Luffing Cranes are indispensable in various industrial settings due to their precision, wide operational range, and enhanced safety features. Despite their high cost and complex maintenance requirements, these cranes offer significant advantages in terms of efficiency and safety, making them a crucial asset in shipbuilding, cargo handling, and construction projects.

Level Luffing Crane

Given that the provided websites and search results do not include the specific content from the URL http://en.wmmp.com.cn/view/630.html, it is not possible to extract information directly from that source. However, based on the information available about companies named or related to “WMMP,” here is a structured guide that provides comprehensive insights on the companies mentioned:

WMMP Tech Private Limited

Overview

• Incorporation Date: 22 May 2007[1][5].
• Location: Maharashtra, India[1][5].
• Type: Private Limited Company[1][5].

Capital and Status

• Authorized Share Capital: INR 50.00 lac[1][5].
• Paid-Up Capital: INR 19.54 lac[1][5].
• Current Status: Strike Off[1].

Registered Address

• 602, 6th Floor, Western Edge – I, Western Express Highway, Borivali (East), Mumbai, Maharashtra – 400066[1].

Directors

• Saurabh Satish Jhaveri
• Slawomir Mysliwiec
• Santosh Bhimaji Morde[1].

WMM PATABENDI, INC. (WMMP, INC.)

Overview

• Type: Foreign Profit Corporation[2].
• Incorporation Date: 23 March 2004[2].

Status

• Current Status: Inactive, revoked for annual report on 26 September 2008[2].

Principal and Mailing Address

• 1000 Venetian Way, APT 1102, Miami Beach, FL 33139[2].

Registered Agent

• Patabendi, Waruna Liyana[2].

Annual Reports

• Filed annual reports in 2005, 2006, and 2007[2].

WMMP LTD

Overview

• Registration: Registered in the UK[3][4].

Company Information

• Registered Office Address: Available on Companies House[3][4].
• Filing History: Includes accounts, annual return, officers, charges, etc.[3][4].

Filing History

• Detailed filing history available on Companies House[4].

Conclusion

The information provided above outlines the key details of different companies associated with the “WMMP” name. WMMP Tech Private Limited is an Indian company that has been struck off, while WMM PATABENDI, INC. is a foreign profit corporation in the U.S. that is currently inactive. WMMP LTD is a UK-registered company with detailed information available on Companies House. This guide helps in understanding the basic structure, status, and key details of these companies.

Two Jib Level Luffing Crane

Since the specific website you mentioned is not accessible in the provided search results, I will create a comprehensive guide based on the general information about Two Jib Level Luffing Cranes from the available sources.

Guide to Two Jib Level Luffing Cranes

Introduction

Level luffing cranes, particularly those with two jibs, are specialized pieces of equipment designed for precise and efficient lifting operations. These cranes are widely used in various industries such as construction, shipbuilding, and port operations.

Key Components and Mechanisms

Hoisting Mechanism

• This mechanism is responsible for lifting and lowering the load. It typically includes a winch system and a hoist motor. The hoisting speed can vary, with some cranes offering multiple speed settings to handle different load conditions[2][3].

Luffing Mechanism

• The luffing mechanism allows the jib to move up and down, enabling the crane to adjust its reach and maintain the hook at a constant height. This is crucial for operations requiring precise load positioning[3].

Slewing Rotating Mechanism

• This mechanism enables the crane to rotate 360 degrees, allowing it to cover a wide working area without needing to reposition the entire crane[2][3].

Travelling Mechanism

• For cranes that need to move along a track or rail, the travelling mechanism provides the necessary mobility. This is often seen in port and shipyard applications[2][3].

Design and Features

Double Jib Configuration

• The double jib design allows for greater flexibility and precision. One jib can be used for heavy lifting while the other can be used for lighter loads or more precise placements. This configuration also helps in maintaining the stability of the crane[2].

Level Luffing Capability

• Level luffing cranes are designed to keep the hook at a constant height as the jib moves up and down. This is achieved through an interconnected pivot system or a “horse head” section on the jib, ensuring that loads near ground level can be moved with maximum care[3].

Safety Features

• These cranes often come equipped with a safe working load indicator that provides the operator with real-time information about the load being lifted. Visual and audible alarms are triggered when the maximum safe load is exceeded, and the system can automatically cut out the hoist and luffing motions to prevent overload[2].

Technical Specifications

Load Capacity and Jib Length

• Two jib level luffing cranes can have varying load capacities and jib lengths depending on the model. For example, some cranes may have a maximum load capacity of up to 45 tons and jib lengths ranging from 30 to 60 meters[1][2].

Power Supply and Motor

• These cranes typically require a significant power supply, often in the range of 64 kilowatts with a power supply voltage of 380V and a frequency of 60Hz. The motor power can vary, but it is usually designed to meet high efficiency and reliability standards[1].

Speed and Performance

• The performance of these cranes includes various speed settings for hoisting, slewing, and trolleying. For instance, hoisting speeds can range from 8.5 to 80 meters per minute, and slewing speeds can be up to 0.8 revolutions per minute[1][3].

Applications

Construction and Shipbuilding

• Level luffing cranes are fundamental in construction and shipbuilding due to their ability to perform precise lifting and installation tasks. They are particularly useful in tight spaces and for handling loads at various heights[3][4].

Port Operations

• In port environments, these cranes are used for freight loading and unloading, container handling, and other material handling tasks. Their mobility and precision make them ideal for intermodal operations[2][3].

Maintenance and Operation

Operator Training

• Operators need to be trained to handle the complex mechanisms and safety features of these cranes. Regular training and certification programs are essential to ensure safe and efficient operation[2].

Regular Maintenance

• Regular maintenance is crucial to maintain the performance and longevity of the crane. This includes checking the hoisting and luffing mechanisms, electrical systems, and performing routine inspections to ensure all components are in good working condition[3].

Conclusion

Two jib level luffing cranes are sophisticated pieces of equipment that offer high precision, flexibility, and safety in various industrial applications. Understanding their components, features, and technical specifications is essential for optimal use and maintenance. These cranes play a vital role in industries requiring precise and efficient lifting operations, making them an invaluable asset in modern construction, shipbuilding, and port operations.

Level Luffing Portal Crane Suppliers and Manufacturers …

Level Luffing Portal Crane: A Comprehensive Guide

Introduction

Level luffing portal cranes are specialized heavy-duty material handling equipment widely used in ports, shipyards, and metallurgical works. These cranes are designed to maintain the hook at a constant level while the jib moves up and down, ensuring precise and safe load handling.

Key Characteristics

Lifting Mechanism

• Level luffing cranes feature a sophisticated lifting mechanism that keeps the hook level during the luffing process. This is achieved through additional mechanisms such as the “horse head” section or careful design of the jib’s geometry[2][3][5].

Luffing and Traveling

• These cranes have the capability to luff (move the jib up and down) and travel (move horizontally) independently or collaboratively, enhancing their productivity and versatility[1][3][4].

Lifting Capacity and Height

• Level luffing cranes can handle a wide range of lifting capacities, typically from 5 to 250 tons, and lifting heights from 5 to 50 meters[1][3][5].

Span and Working Range

• The crane’s span can vary from 20 to 50 meters, making them suitable for various dock and shipyard applications. They offer a large working range, which is essential for handling cargo in different areas of the port or shipyard[1][3][4].

Components and Structure

Main Components

• The crane is composed of several key components:
• Boom or jib
• Slewing platform
• Lifting mechanism
• Luffing mechanism
• Slewing mechanism
• Machine room
• Cabin
• Cylinder-type portal
• Balance girder
• Wind withstand device
• Safety guard devices[1][4][5].

Mechanisms

• Luffing Mechanism: Allows the jib to move up and down while keeping the hook level.
• Slewing Mechanism: Enables the crane to rotate 360 degrees.
• Traveling Mechanism: Allows the crane to move along a rail track or runway beam[1][3][4].

Applications

Ports and Harbors

• Level luffing cranes are extensively used in ports for loading and unloading containers, sundries, and bulk cargo. They are ideal for handling shipping containers and heavy materials due to their high efficiency and reliability[1][3][5].

Shipbuilding and Repair Yards

• These cranes are crucial in shipbuilding and repair yards for their ability to handle heavy loads with precision, especially near ground level[2][4][5].

Metallurgical Industry

• They are also used in the metallurgical industry for material handling, where high lifting capacities and precise load control are necessary[4][5].

Safety and Reliability

Safety Devices

• Level luffing cranes are equipped with various safety devices to ensure safe operation:
• Overload limit switches
• Rubber buffers
• Electric protective devices
• Emergency stop systems
• Voltage lower protection functions
• Current overload protection systems
• Lifting height limit devices[4][5].

Operational Stability

• These cranes are designed to operate stably and reliably, even in challenging environmental conditions. They can handle loads smoothly and maintain safety during operation[1][3][5].

Control and Operation

Control Methods

• Level luffing cranes can be controlled through different methods:
• Cabin control
• Pendent line control
• Remote control[5].

Power Supply

• They typically operate on a three-phase AC power supply with a voltage frequency of 380V, 50Hz. Customized power supply options are also available[3][5].

Maintenance and Support

Warranty and Support

• Many manufacturers offer warranties and comprehensive support, including free distribution of wearing parts, assembly videos, technical support, and field installation services[3][5].

Customization

• Level luffing cranes can be customized to meet specific client demands. Manufacturers often provide engineering teams to work on personalized product requirements[3][5].

Environmental Conditions

Ambient Temperature

• These cranes can operate in a wide range of ambient temperatures, typically from -25°C to 45°C[5].

Wind Speed

• They are designed to withstand wind speeds up to 20m/s during working hours and up to 42m/s during non-working hours[5].

Humidity

• Level luffing cranes can operate in environments with relative humidity up to 95% at 40°C[5].

Conclusion

Level luffing portal cranes are indispensable in modern port, shipyard, and metallurgical operations due to their high efficiency, reliability, and precision in load handling. With their advanced mechanisms, robust construction, and comprehensive safety features, these cranes ensure safe and efficient material handling in various industrial settings.

Good Price Four-link Level Luffing Crane in Stock

Guide to Four-Link Level Luffing Cranes

Introduction

Four-link level luffing cranes are sophisticated pieces of equipment designed for efficient and precise material handling, particularly in environments such as ports, shipyards, and dockyards. These cranes are characterized by their ability to maintain the hook at a constant level while the jib is moved up and down, ensuring accurate and stable load movement.

Key Components and Mechanisms

Frame and Structure

The four-link level luffing crane is composed of a robust steel frame that includes several key mechanisms:
– Lifting Mechanism: Responsible for the vertical movement of the load.
– Luffing Mechanism: Allows the jib to move up and down.
– Slewing Mechanism: Enables the crane to rotate.
– Traveling Mechanism: Facilitates the movement of the crane along a rail or track[2][3][4].

Level Luffing System

The level luffing system is the core feature of these cranes. It ensures that the hook remains at the same level during jib movements. This is achieved through:
– Horse-Head Jibs: Modern cranes use an additional “horse head” section at the top of the jib, designed to maintain the hook’s level through linked pivots.
– Powered Level-Luffing: Advanced systems use electronic controls and reversible motors to adjust the hoist cable, providing high positioning accuracy[1].

Applications

Port and Dockyard Operations

These cranes are extensively used in ports for loading and unloading cargo, including containers, bulk cargo, and sundries. They are also essential in shipbuilding and repair yards due to their precision and high working efficiency[2][3][4].

Material Handling

In addition to port operations, four-link level luffing cranes are used in the metallurgy industry and other heavy-duty material handling tasks. Their ability to handle heavy loads with precision makes them invaluable in these settings[2][3].

Features and Benefits

High Working Efficiency

These cranes are designed for high-speed operations, with fast lifting and rotating speeds, which significantly enhances the efficiency of loading and unloading processes[3].

Stability and Reliability

The cranes feature stable and reliable operation, ensuring calm movement and comfortable operation. This stability is crucial for safe and accurate load handling[2][3].

Customization and Flexibility

Many manufacturers offer customized solutions based on client requirements. This includes variations in lifting capacity, lifting height, and crane span, making the cranes adaptable to different operational needs[2][3].

Safety Devices

To ensure safe operation, these cranes are equipped with various safety devices such as:
– Overload Limit Switch
– Rubber Buffers
– Electric Protective Devices
– Emergency Stop System
– Lifting Height Limit Device
These devices prevent personal casualties and mechanical damage[2].

Operational Mechanics

Luffing and Slewing

The crane’s jib can be luffed (moved up and down) while the hook remains level. The slewing mechanism allows the crane to rotate, providing a wide working range[1][3].

Traveling Mechanism

The traveling mechanism enables the crane to move along a rail or track, allowing it to cover large areas such as docks and shipyards[2][3].

Maintenance and Support

Convenience Maintenance

The design of these cranes includes features that make maintenance convenient, such as easy-to-replace parts and accessible electrical equipment[2].

Technical Support

Manufacturers often provide technical support, including assembly videos, field installation, and ongoing maintenance services. This ensures that the crane operates optimally over its lifespan[3].

Conclusion

Four-link level luffing cranes are advanced tools for material handling, offering a combination of precision, efficiency, and reliability. Their ability to maintain the hook at a constant level during jib movements makes them indispensable in various industrial settings. With customizable options, robust safety features, and comprehensive support, these cranes are ideal for demanding operational environments.

Level Luffing Crane Manufacturer

Since the provided URL does not lead to a specific page with detailed information, I will create an in-depth guide based on the general characteristics and features of portal cranes, utilizing the information from the other relevant sources.

Portal Cranes: A Comprehensive Guide

Introduction

Portal cranes, also known as gantry cranes or portal jib cranes, are heavy-duty lifting machines commonly used in various industrial settings such as ports, shipyards, and large-scale workyards. They are designed to handle heavy loads efficiently and are supported by ground tracks or foundations.

Key Components and Features

Structure and Design

• Portal cranes are supported by legs on both sides, allowing them to run along ground tracks. This design enables rail vehicles or other ground vehicles to pass through the gantry[4].
• They come in different types, including single boom and four-bar linkage designs. The single boom portal crane features a simple structure, light weight, and low cost, while the four-bar linkage portal crane is optimized for stable amplitude-changing and low power consumption[3].

Lifting Capacity and Operating Radius

• The lifting capacity of portal cranes can range from 5 to 80 tons, depending on the model and application[4].
• The operating radius can vary from 11 to 40 meters, with some models offering multiple radius options (e.g., 30m, 35m, 39m)[3].

Span and Lifting Height

• The span of portal cranes can extend up to 50 meters, and the lifting height can also reach up to 50 meters[4].
• Some models offer extendable spans and lifting heights, making them versatile for different tasks[5].

Mechanism Speeds

• Hoisting speeds can range from 25 to 60 meters per minute, depending on the crane type and load[3].
• Derricking speeds (for four-bar linkage cranes) can reach up to 50 meters per minute, while swing speeds typically range from 0.8 to 1.5 revolutions per minute[3].
• Travel speeds are generally around 26 meters per minute[3].

Power Supply and Control

• Portal cranes are typically powered by a 3-phase AC power supply with various voltage options (e.g., 380V, 400V, 415V, 440V) and frequency (50/60Hz)[2][5].
• Control methods include ground handle control, wireless remote control, and cabin control[2].

Applications

Industrial Settings

• Portal cranes are widely used in ports, yards, stations, and shipyards for loading and unloading operations[4].
• They are also used in large-scale workstations and industrial work yards for various material handling tasks[3].

Specific Tasks

• Loading and unloading of supply vehicles and ships.
• Offshore installation work.
• Deck handling.
• General material handling in factories, workshops, and warehouses[3].

Working Class and Safety

Working Class

• Portal cranes are classified based on their working class, with common classifications ranging from A7 to A8. This classification indicates the crane’s duty cycle and suitability for different work environments[3][4].

Safety Features

• Portal cranes are designed with safety in mind, featuring smooth operation, simple and safe controls, and robust structures to handle heavy loads[4].
• They are built to withstand various environmental conditions, including different wind pressures and wheel pressures[1].

Customization and Maintenance

Customization

• Portal cranes can be customized according to customer needs, including span, lifting height, and control methods[4].

Packaging and Transportation

• Components are carefully packaged to prevent damage during transportation. Lifting and electrical components are packed in plywood boxes, while beams and other main parts are covered with plastic woven cloth to prevent rusting[4].

After-Sales Support

• Manufacturers often provide after-sales support, including video technical support, online support, and spare parts[2].

Conclusion

Portal cranes are essential equipment in heavy-duty material handling, offering a combination of high lifting capacity, versatile design, and efficient operation. By understanding their key components, features, and applications, users can select the right portal crane to meet their specific needs and enhance their operational efficiency.

Level Luffing Crane China Manufacturer Guide

Level Luffing Crane: A Comprehensive Guide

Introduction

A level luffing crane is a specialized type of crane designed to maintain the hook at a constant level while the jib is moved up and down. This feature is crucial in applications where precise and careful movement of loads near ground level is necessary, such as in construction, shipbuilding, and freight loading.

How Level Luffing Cranes Work

Mechanism

The primary mechanism of a level luffing crane involves the movement of the jib up and down to drive the hook inwards and outwards relative to the base. This is achieved through several methods:
– Horse-Head Jibs: Modern level luffing cranes often incorporate an additional “horse head” section at the top of the jib. The geometry of this section ensures that the hook remains level through the linked action of the pivots[2][4][5].
– Toplis Cable Luffing: An early form of level-luffing gear, the Toplis design uses a mechanical linkage and reeving of hoist cables over pulleys to compensate for the jib’s movement, keeping the hook level[1].
– Powered Level-Luffing: Advanced systems use electronic controls and reversible motors to adjust the hoist cable, providing high positioning accuracy. Some systems also employ hydraulic gearboxes for high-precision applications[1].

Key Components

• Vertical Mast: The crane is attached to a vertical mast that serves as the base.
• Rotating, Latticed Jib: The jib is designed to slew and move inward and outward from the base.
• Hook and Hoist System: The hook is connected to a hoist system that adjusts to maintain the level during jib movement[5].

Applications

Construction

Level luffing cranes are particularly useful in construction projects where space is limited and precise load placement is required. They can operate in congested areas with reduced slewing radius, making them ideal for urban construction sites[5].

Shipbuilding

In shipbuilding, these cranes are essential for lifting and installing components with high accuracy near ground level. They are also used for freight loading in ports and for the construction of small to medium-sized ships[2][4].

Freight Loading

Level luffing cranes are used in ports for container loading and unloading, as well as for other freight handling tasks. Their ability to maintain the hook level ensures safe and efficient loading operations[4].

Features and Advantages

Design and Operation

• Modular Designs: Modern level luffing cranes have intelligent, modular designs that facilitate fast cycle times, easier erection, disassembly, and transportation[2].
• Low Maintenance: These cranes are designed with low-maintenance architecture and include modern safety features such as anti-collision and zoning systems, and CCTV cameras[2].

Safety and Precision

• Overspeed Safety and Load Measurement: Built-in encoders and load measurement devices ensure high hoisting speeds with safety and accuracy[2].
• High Precision: Electronic controls and reversible motors provide positioning accuracy of inches, making them suitable for high-precision tasks[1].

Operator Comfort and Control

• Comfortable Operator Cabs: The cabs are equipped with climate controls, flexible seating, and easy-to-read display screens. Step-less motor operation of the trolley and hoist allows for slow and precise load movement[2].

Types of Level Luffing Cranes

Mechanical Level Luffing

This method uses purely mechanical linkages to maintain the hook level. It is simpler but less precise compared to powered systems[1].

Powered Level Luffing

These cranes use electronic controls and hydraulic or cable systems to adjust the hoist cable, providing higher precision and accuracy[1].

Benefits and Considerations

Productivity and Cost Savings

Level luffing cranes enhance worksite productivity and offer cost savings through their efficient and precise operation. They are particularly beneficial in projects where careful load movement is critical[2].

Space Efficiency

These cranes are suitable for construction projects with limited space, as they can operate effectively within a reduced slewing radius[5].

Operator Training

Given the complexity and precision required in operating level luffing cranes, operators need specialized training to ensure safe and efficient use of the equipment[2].

Conclusion

Level luffing cranes are indispensable in various industries due to their ability to maintain the hook at a constant level while moving the jib. Their precise operation, safety features, and efficiency make them a valuable asset in construction, shipbuilding, and freight loading applications. Understanding the mechanisms, features, and benefits of these cranes is essential for selecting and utilizing the right equipment for specific tasks.

Buy Wire Rope Luffing Crane & Rack Luffing Crane from …

Guide to WUXI NEIHE MACHINERY MANUFACTURING CO., LTD.

Company Profile

Overview

WUXI NEIHE MACHINERY MANUFACTURING CO., LTD. is a professional enterprise established in 1999, specializing in the innovation, design, manufacture, installation, modification, maintenance, and repair of heavy-duty port machinery products.

Location

The company is located in YangShan, Wuxi, Jiangsu, China, near scenic Taihu Lake. It is strategically positioned near major transportation routes including the Beijing-Hangzhou Grand Canal, 312 State Road, 342 provincial highways, Shanghai-Nanjing Expressway, and Wuxi-Yixing Expressway, as well as the Shanghai-Nanjing railway.

Workforce and Market Reach

The company employs 11-50 people and serves a global market, including North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe, Central America, Northern Europe, Southern Europe, and South Asia, in addition to the domestic market.

Main Products

Wire Rope Luffing Crane

• Designed for heavy-duty lifting operations, these cranes use wire ropes for lifting and are often used in port and construction environments.

Rack Luffing Crane

• These cranes use a rack and pinion system for luffing (raising and lowering the boom) and are known for their precision and stability.

Grab and Clamshell Grabs

• Includes various types such as Remote Control Rope Grabs, 10cbm Hydraulic Grab Clamshell Grapper, and Wireless Remote Control Clamshell Grab for Dry Bulk.
• Remote Control Rope Grabs: FOB Price: $1899 / Set, Min. Order: 1 Set
• 10cbm Hydraulic Grab Clamshell Grapper: FOB Price: $1599 / Set, Min. Order: 1 Set
• Wireless Remote Control Clamshell Grab for Dry Bulk: FOB Price: $18888 / Set, Min. Order: 1 Set

Electric Mobile Tire Crane

• Mobile cranes that operate on tires, providing flexibility and mobility in various work environments.

Model-HGQ Single-arm Rack Fixed Crane

• A fixed crane with a single arm, designed for stable and efficient lifting operations.

Four-bar Linkage Fixed Crane

• Utilizes a four-bar linkage mechanism for precise control over the crane’s movements.

Model-HGQ Slewing Bearing Fixed-base Crane

• Features a slewing bearing for 360-degree rotation, enhancing operational versatility.

Model-MQ Four-bar Linkage Port Gantry Crane

• A gantry crane designed for port operations, using a four-bar linkage system for optimal performance.

Additional Products

16ton Seaport Jib Crane Portal Crane

• FOB Price: $50000 / Set, Min. Order: 1 Set
• Designed for heavy-duty lifting in seaport environments.

Radio Vessel Grab Bucket

• Available for sale, these grabs are designed for efficient material handling on vessels.

Quality Assurance and Customization

ISO9001:2015 Certification

• The company adheres to the ISO9001:2015 quality assurance standards, ensuring high-quality products and services.

Custom Design and Manufacture

• WUXI NEIHE MACHINERY MANUFACTURING CO., LTD. can provide non-standard design, manufacture, and construction based on user-specific requirements.

Applications and Benefits

Port Handling Services

• Products are widely used in various port terminals, cargo depot warehouses, and ships for handling operations.

Economic and Social Benefits

• The company is widely praised by users for creating better social and economic benefits worldwide through its reliable and efficient machinery solutions.

Conclusion

WUXI NEIHE MACHINERY MANUFACTURING CO., LTD. is a reputable manufacturer of heavy-duty port machinery, offering a diverse range of products designed to meet the specific needs of various industries. With a strong focus on quality, innovation, and customer satisfaction, the company has established itself as a reliable partner for global clients seeking efficient and reliable machinery solutions.

Frequently Asked Questions (FAQs)

What are the main types of level luffing cranes and their applications?

Level luffing cranes are categorized into several types, each with specific applications. One of the primary types is the fixed jib level luffing crane, which features a fixed jib that can move horizontally to maintain a level height as the load is moved. This type is often used in smaller construction sites or areas with limited space. Another type includes cranes with single arm steel wire rope luffing, single arm rack luffing, or four link arm rack luffing structures, which are commonly used in docks, shipyards, and bulk cargo docks due to their large working range, high lifting height, and fast speed.

What are the key specifications to consider when sourcing a level luffing crane?

When sourcing a level luffing crane, several key specifications need to be considered. These include the maximum lifting capacity, which typically ranges from 10 to 50 tons, depending on the size and configuration of the crane. The maximum radius is another important factor, usually ranging from 30 to 60 meters. Additionally, the luffing speed, which is the rate at which the jib can be raised and lowered, is crucial for efficient operation. Other specifications include lifting height, crane span, and working power, which must align with the operational requirements of the project.

How do you ensure the reliability and quality of a level luffing crane from a Chinese supplier?

To ensure the reliability and quality of a level luffing crane from a Chinese supplier, it is essential to conduct thorough background research on the manufacturer. This includes checking references, visiting manufacturing facilities if possible, and requesting product certifications such as ISO 9001 and ISO 14001. It is also crucial to verify that the crane meets all safety and quality standards required for operation in your location. Establishing a good relationship with the manufacturer or supplier for ongoing support and maintenance is also vital.

What is the typical work process for operating a level luffing crane?

The work process for operating a level luffing crane involves several key steps. First, planning the lift is essential, which includes assessing the load, determining the most efficient and safe way to carry out the lift, and calculating the weight of the load and any obstacles. Next, setting up the crane involves properly assembling and erecting the crane according to the manufacturer’s instructions, ensuring it is securely positioned on a stable surface. During operation, the crane operator controls the movements of the crane, raising and lowering the load, swinging it from side to side, and moving it horizontally. The crane’s ability to luff, or adjust the angle of the boom while maintaining a level horizontal position, is a critical feature. Finally, the operator must carefully move the load to its desired location while continuously monitoring its safety.

What post-purchase considerations are important for maintaining a level luffing crane?

After purchasing a level luffing crane, several post-purchase considerations are crucial for its maintenance and longevity. It is important to perform a thorough inspection of the crane upon arrival to ensure it is in good working condition. The crane should be installed and commissioned by a qualified technician or engineer to ensure proper operation and safety compliance. Keeping maintenance and service records up to date is vital to prolong the lifespan of the crane and ensure safe operation. Additionally, staying in contact with the manufacturer or supplier for any necessary technical support or spare parts is essential for ongoing maintenance and troubleshooting.