Double Girder Gantry Crane
What is Double Girder Gantry Crane?
A double girder overhead crane is a lifting solution designed to carry medium and heavy duty loads. By using two adjacently positioned beams, double girder cranes offer improved support for the goods being handled, allowing the movement of larger capacities.Double girder variants of gantry cranes are versatile material handling systems for moving and handling heavy loads in production and manufacturing facilities and construction sites. In general, gantry cranes are distinguished for their usability, mobility, and stability while handling heavy loads.
Advantages of Double Girder Gantry Crane
High load capacity:One of the main advantages of a double girder gantry crane is its high load capacity. These cranes can lift and move heavy loads ranging from 5 tons to over 500 tons, making them ideal for use in industries such as construction, manufacturing, and shipping.
Greater height and span:Another advantage of a double girder gantry crane is its ability to operate at greater heights and spans. The dual girder design provides greater stability and support, allowing these cranes to reach heights of up to 100 feet or more and spans of up to 150 feet.
Improved safety:With their robust structure and high load capacity, double girder gantry cranes offer improved safety compared to other types of cranes. They are less prone to tipping over or collapsing, and their design allows for greater control and precision when moving heavy loads.
Versatility:Double girder gantry cranes are highly versatile and can be customized to suit specific requirements. For example, they can be fitted with additional features such as hoists, trolleys, and grabs to handle different types of materials.
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Components of Double Girder Gantry Crane
The structure of a double girder gantry crane consists of its main girder or beam and its legs. In the case of a semi-gantry crane, the structure is a beam and one leg. The beam is the main support for the load. The size, length, and number of beams varies depending on whether the gantry crane is light or heavy duty and the weight of the load. In regard to the legs, one side is rigid while the other is flexible to reduce deadweight and account for span deviation.
The trolley moves the hoist horizontally along the girder of the crane and may be attached to the top or the underside. The three types of trolleys are low, normal headroom, and double girder.Trolleys with spacing washers can be adjusted to fit the beam by adding or removing washers. Screw adjustment trolleys use a screw mechanism to do adjustments. Wheel bumpers prevent trolley wheels from colliding with other equipment while side guide rollers keep the trolley from wobbling.
The hoist on a double girder gantry crane is a form of winch mounted on the trolley to lift and lower the load along a vertical plane, and it moves back and forth with the movement of the trolley. Hoists that are chain driven are capable of lifting up to five tons, while wire rope hoists can lift five tons or greater.Reeving describes the configuration of the wire rope or chain and the blocks and drum of the hoist. The various types of reeving effect the headroom, lifting speed, and capacity. The headroom is the distance from the beam to the hook. The terms single or double refer to the number of ropes or chains.
A festoon is the form of wiring that delivers power to the trolley and hoist. The provided power comes from the busbar, or receiving station, to be distributed to the bridge panel to power the crane. Cables send the power from the panel to the hoist and bridge drives to run the hoist, trolley, and bridge. The power for a gantry crane can be direct ac, induction ac, or synchronous.
The controls of a double girder gantry crane give the operator direct control of the crane‘s movements and the hoist. There are several varieties of crane control methods, ranging from wired or remote control for a small sized gantry crane to cabins and booths where the operator rides on the crane or sits in a location to observe crane movement.The popular trend in double girder gantry crane operations has been to move the operator out of a cabin and have them operate the crane from the ground. In those situations, the operator uses a pendant or remote radio control that has buttons, levers, or other command mechanisms to move and position the double girder gantry crane.
Application of Double Girder Gantry Crane
Double girder gantry crane are widely used in industrial manufacturing to lift and move materials, supplies, and products. All varieties of double girder gantry crane are an essential part of the auto, steel, and aircraft industries due to the nature of their production processes. In the auto and aircraft industries, double girder gantry crane are part of the installation and placement of engines.
In small engine repair shops, the engines to be repaired have to be lifted and positioned so that the technician can view all parts of the engine. Large overhead cranes and simple winches are either impractical or insufficient to do the job. For this reason, repair shops depend on portable double girder gantry crane that have the load capacity to lift an engine and the mobility to reposition it.
The area where large heavy duty cranes are used the most is shipyards; they are used to move extremely heavy loads and ship parts. Every aspect of a transport ship is large and heavy, from the engines that power the ships to the loads they carry. The mobility and versatility of double girder gantry crane make them the perfect choice. The demands of shipyard applications require the use of a variety of heavy duty gantry cranes for ship building, repair, unloading, and material movement.
The versatility of double girder gantry crane is the main reason they are so useful in warehousing operations. Though it could be assumed that warehouses have the space for overhead cranes, in many cases, the structure of warehouse buildings cannot support them. Warehouses generally use an assortment of double girder gantry crane depending on the types of loads being stored. Normally, warehouse cranes are required to be mobile, so they can move extremely heavy loads from unloading to loading.
Another industry that relies on double girder gantry crane for their mobility and load capacity is construction. In the construction industry, crews move in to build a structure or building, then rapidly move out when the job is done. This type of instant in and out requires tools that can be used to fulfill the needs of the application but are capable of being torn down and removed. It is for these reasons that double girder gantry crane have become so important in the construction industry.
Part of the supply chain is the movement of shipping containers that are the size of a semitrailer and exceptionally heavy and are transported by planes, trains, and ships. Unlike shipping containers of the past that could be moved by forklift, these huge, boxcar sized containers are moved, positioned, and loaded using mobile double girder gantry crane that efficiently lift them to be placed on trucks or trains.
Lifting Capacity of Double Girder Gantry Crane
Double girder gantry crane are designed to handle a wide range of loads, from a few hundred pounds to hundreds of tons. The types of double girder gantry crane referred to as light duty have a capacity of one to ten tons and come with a single girder with fixed or adjustable versions.
Heavy duty double girder gantry crane have a capacity of thirty to over two hundred tons and are double girder rail mounted.
One and two ton
Very small and used in warehouses, workstations, garages, and workshops where light lifting is required. They have a single girder and are portable.
Five ton
A light duty crane used on cargo yards, freight yards, ports, workshops, and warehouses. They can be single or double girder in semi and portable designs.
Ten and fifteen ton
Capable of small and medium lifting applications and used where the structure of a building will not support an overhead crane.
Twenty ton
Able to lift large and small loads indoors or outdoors and comes in single or double girder designs. The single girder design is normally l shaped.
Thirty ton
Come in several designs and are capable of medium to heavy lifting. They are available in a wide range of types, sizes, and configurations.
Fifty ton and greater
The beginning of the exceptionally heavy duty capacity cranes. They come in double girder designs.
How to Choose Double Girder Gantry Crane
Load capacity
The load capacity is a crucial factor to determine before purchasing a double girder overhead crane. Evaluate the maximum weight you need to lift and handle regularly, as well as any potential future load requirements. Double girder overhead cranes typically have higher load capacities compared to single girder cranes, making them suitable for heavy-duty applications.
Span and lifting height
Evaluate the span (the horizontal distance between the runways) and the lifting height required for your lifting operations. Different types of double girder overhead cranes are designed to accommodate varying spans and lifting heights. Ensure that the crane you choose can cover the entire working area while providing sufficient lifting height for your specific needs.
Duty class and usage frequency
Consider the duty class and usage frequency of the crane. Duty class refers to the intensity and duration of crane operation. Determine whether your application requires light-duty, medium-duty, or heavy-duty operations. Additionally, consider how frequently the crane will be used on a daily or weekly basis. This information will help you select a crane that can withstand the expected workload and provide optimal performance and longevity.
Speed and control options
Evaluate the desired speed and control options for your overhead crane. The speed of the crane, including lifting, trolley travel, and bridge movement, should align with your operational needs. Consider the productivity gains and safety aspects associated with faster lifting and transportation speeds. Additionally, explore control options such as pendant control, radio remote control, or cabin control to ensure ease of operation and efficiency.
Environmental factors
Assess the environmental conditions in which the crane will operate. Factors such as temperature, humidity, dust, and corrosive substances can impact crane performance and longevity. Select a double girder overhead crane that is built with appropriate protective features and materials to withstand the specific environmental challenges of your work environment.
Safety features
Safety should be a top priority when choosing an overhead crane. Look for safety features such as overload protection systems, emergency stop buttons, limit switches, and anti-collision devices. These features help prevent accidents, protect personnel, and safeguard valuable equipment during crane operation.
Customization options
Consider whether your application requires any customization options. Double girder overhead cranes can be tailored to meet specific needs, such as adding auxiliary hoists, platforms, or specialized lifting attachments. Discuss your requirements with overhead crane manufacturers to ensure that the chosen crane can be customized to suit your unique operational demands.
Selecting the right type of double girder overhead crane involves careful consideration of load capacity, span, lifting height, duty class, speed, controls, environmental factors, safety features, customization options, and supplier reputation. By thoroughly assessing these factors and consulting with experts, you can make an informed decision that meets your specific material handling needs, ensuring efficient operations and maximizing productivity in your facility.
What You Should Know When Use Double Girder Gantry Crane
Before operation
To inspect brake, hook, rope and safety device and other parts of the double girder overhead crane, make sure all parts are in right condition and place.
Before turning on power switch, the overhead crane operator must ensure there is no body on walking plate and rail. Once circuit interrupter is locked and there is warning board, operator should stop to start crane and ask related person to check.
●No load test: Rotate brake wheels of all mechanisms to make drum shaft or wheels spin for one circle, no block phenomena is allowed. Then turn on power, try to start the overhead crane without loading.
Static load test: It is carried out to test the load-bearing capacity of all parts and metal structure of the double girder overhead crane;
●Dynamic load test of overhead crane: Test lifting up and dropping down with rated capacity for several times. And make trolley to travel for 3-5 times, finally stop in middle of span, to check brakes, limiter, electric control and all mechanisms.
Test and inspect all electric components
When the double girder overhead crane is used at first time, it must be inspected after lifting 0.5m high, worker should check brake performance, make sure it is reliable, then start work regularly.
Alarm should be run with following condition,lifting and dropping, crane and trolley are traveling.If crane run far away, being difficult to see, the alarm must ring all the time.When one crane travel close to another crane on same rail.When lifting object is near to somebody.
If power is cut off suddenly during operation, all control buttons should be set back to zero. Before re-start crane, inspect all parts in good condition.
If you want to change crane / trolley traveling direction when it is traveling well, you must set back to zero first, then start another direction.
If one overhead crane has two hooks, when two hooks are replaced to use, or both lifting height is close, you should operate one hook to avoid two hooks collide.
If one crane has two hooks, we don’t allow two hooks to lift two objects at same time. When not work, adjust lifting brake.
Don’t allow to stop crane by limiter on limit position. When crane is loading, we can’t adjust lifting brake.
How to Maintain Double Girder Gantry Crane
Cleaning and maintenance
Regularly clean the surface of the double-girder gantry crane and the inside of the equipment to keep the equipment clean and tidy. During the cleaning process, attention should be paid to cleaning up debris and dust that may be generated during the operation of the equipment to avoid adverse effects on the operation of the equipment.
Check structural parts
Check whether the structural parts of the double-girder gantry crane are intact and whether there are deformations, cracks, wear and other problems. Abnormalities found need to be processed and repaired in a timely manner to ensure the structural stability and safety of the equipment.
Check electrical system
Check whether the electrical system of the double-girder gantry crane is normal, including power lines, control lines, motors, etc. Any problems found need to be repaired and replaced in time to ensure the normal operation of the equipment's electrical system.
Check safety protection devices
Check whether the safety protection devices of the double-girder gantry crane are intact and reliable, such as limiters, buffers, overload protection devices, etc. Problems found need to be dealt with and repaired in a timely manner to ensure the safety performance of the equipment.
Lubrication and maintenance
Regularly lubricate and maintain the bearings, pins, tracks and other parts of the double-girder gantry crane to ensure the smoothness and stability of the equipment during operation.
Check the wire rope
Check whether the wire rope of the double-girder gantry crane has any problems such as wear, broken strands, corrosion, etc. Any problems found need to be replaced and repaired promptly to ensure the safety performance of the equipment.
FAQ
Q: What is double girder gantry crane?
Q: What is the difference between single and double girder crane?
Q: What is a double girder?
Q: What is the difference between a gantry girder and a crane girder?
Q: What is the difference between a crane and a gantry crane?
Q: What are the different types of gantry girders?
Q: What is the main girder in gantry crane?
Q: How many types of gantry crane are there?
Q: Which is the most efficient gantry girder?
Q: What is the span of a double girder crane?
Q: What is a girder on a crane?
Q: Why is it called a gantry crane?
Q: Is a jib crane a gantry crane?
Q: Can a gantry crane move?
Q: What is the main purpose of gantry girder?
Q: What is a gantry girder also known as?
Q: What is a top running double girder overhead crane?
Q: What is a top running double girder overhead crane?
Q: What is the difference between a hoist and a gantry crane?
Q: What is the principle of gantry girder design?