Wheel Load Design Calculation of Jib, Double Girder, EOT Crane

The crane wheel load, usually referred to as maximum wheel load is the total load in pounds that any single crane wheel will see. The formula for determining…

MWL is Bridge weight / 2 + {Live load (crane capacity + hoist weight) x 15%impact*)/ Number of wheels on a single end truck.

For a top running 5-ton capacity crane, with a bridge weight of 8000 lbs. and a hoist that weights 900 lbs. with four wheels total:
8000/2 + (10000+9000 x 1.15)/2=12925 *15% impact for hoist speeds under 30 fpm in CMAA Class C Service

How is crane deflection measured?

Deflection is the measurement for the displaced structural element under load. In the case of overhead cranes, displacement of any member or part of crane is considered as deflection. The vertical and horizontal displacement can cause changes in the design of the crane and also impact the working of the device.

Let us discuss the different ways to calculate the vertical and horizontal deflections. Also, the various organizational specifications for different types of cranes are also explained.

VERTICAL DEFLECTION CRITERIA

Vertical deflection impacts the mast, columns, wall and all other parts that stands vertically. In vertical deflection criteria, the highest deflection ratio for lifting device is defined.

HORIZONTAL DEFLECTION CRITERIA

Horizontal Deflection impacts the horizontal parts of the image. Horizontal deflection is measured for workstation bridge cranes and workstation jib booms. Horizontal Deflection Criteria is the highest deflection ratio for runway or bridge crane kind of device.

What is the wheel load?

The amount of load carried out by a single wheel of the vehicle is wheel load. Each wheel gets some fraction of weight when we use a crane to lift and move the load. Though the wheels work mutually together, each wheel transmits its part to the road.

Each wheel can carry a specific amount of load, but dual wheel or dual tandem assembly can be used to carry more weight than a single wheel. Equivalent single wheel load of the dual wheel can generate the same amount of deflection, maximum stress, and contact pressure, etc. on road or track.

Boyd and foster method, also known as the semi-rational method can be used to find equal stress for ESWL (equivalent single wheel load).

What is the design wheel load?

The pavements and their failure are directly related to the design wheel load. Pavements fan fail due to several reasons like the amount of traffic, loading, structural models, material characterization, environment, etc. but wheel load is an important factor to determine the depth of road or track.

In general terms design load is a load that the system can not take and can not produce the expected result during that situation. It can be also defined as the system will fail in an unexpected case.

These kinds of situations occur because some time engineers fail to design a system that can handle unexpected loads.

What is the standard axle load?

Determining the wheel load or axle load of a single vehicle is easy task whereas determining the types of wheels loads is a difficult task. The wheel load determination is related to pavement design life.

The determination of types of wheel load is required to understand the damage to the pavement. The destruction of pavement is the primary concern that is caused by wheel load.

The most commonly used approach in this case is converting the pavement damage from single or dual wheels loads into a single load with the help of various magnitudes which is called “standard” or “equivalent” loads. At that time all the factors related to traffic are used under one term like equivalent single axle load.

What is point load of a crane?

Point loads occur when relatively high weights are concentrated on a small bearing area.

So; point load on a crane with hooks is a load that is not centered. If you try to pick something up with the end of the crane hook, the load is not centered and would be “point loaded”. This type of load will stress the crane cables. When the load falls off the hook-point, the crane cables react – and can break strands of the cable.

The crane cable consists of an inner cable and outer cables – so as a load is placed on the cable, it stretches. If this load suddenly shifts or falls, the cables retract quickly and can break. This is dangerous; as you may not notice the inner cable has broken (could be a small bulge in the cable). Using the crane with a broken cable can cause it to fail and drop the load.

A stable load is one in which the centre of gravity of the load is directly below the main hook and below the lowest point of attachment of the slings. The center of gravity of an object is that point at which the object will balance. The entire weight may be considered as concentrated at this point. A suspended object will always move so that the center of gravity is below the point of support. In order to make a level or stable lift, the crane or hook block must be directly above this point. Thus a load which is slung above and through the center of gravity will be stable and will not tend to topple or slide out of the slings.

We are a well-established eot crane manufacturer in ahmedabad  and exporter of EOT cranes with two girders, that find application for the purpose of lifting & transporting the loads over 10 T and for span of more than 25 m. Comprising of 2 torsion-free box girders, these cranes such as EOT cranes with two girders, traveling eot cranes, material handling eot cranes etc., are compatible, when heavy loads and wide spans are required. These EOT cranes with two girders are offered by us in the load capacities of up to 100 T and with spans up to 50 M.

Eot Crane Design

‘KRISHNA CRANE’ EOT cranes with two girders are designed & manufactured accordance with IS-807, IS-3177 or IS 4137 considering factor of safety in respect to appropriate class of duty.

Motors

The motors are used specially crane duty suitable for frequent starting, reversing & braking in accordance with IS-325. Motors are totally enclosed in dust proof construction foot / flange mounted TESC / TEFC , Sq. cage motors with integrated safety brakes, insulation class F, IP54 protection for hoisting, CT & LT motions.

Brakes

Single/dual-disc/ shoe electromagnetic/ EHT brakes with features like automatic braking on power failure (FAIL SAFE).

Gear Box

The entire gear boxes are made of accurate hob cut helical / spur gears & pinions having hardness 250 to 350 BHN made from carbon alloy steel. All gears & pinions running on anti friction type ball / roller bearings in totally enclosed oil bath giving constant splash lubrication. The helical / Spur gear designed for adequate strength and optimum wear resistance for smooth operation & long life.

Electrical Panel

Modular design, ease to install and maintain, reliable operation, fuse less circuitry, ducted wiring and compact terminals. Motor overload protection to prevent overloading.

Limit Switch

Safety limit switches for stoppers will be provided to prevent over traveling in all motions.

Painting

Two coats of primer before assembly & two coats of synthetic enamel after testing.

Optional Features:

• Variable speed through VVF Drive
• Soft starter
• Slipping motors
• Wireless Radio Remote control
• Shrouded DSL system for power feeding
• Flameproof
• Cabin Operated.
• Double girder eot crane catalogue

Understanding Load Factors and Their Impact on EOT Crane Design

Electric Overhead Traveling (EOT) cranes are designed to safely and efficiently handle a specified weight limit. However, several load factors influence this capacity and ultimately impact the design of the EOT crane, including:

• Static Load (Dead Load): This is the weight of the crane itself, including the bridge structure, trolley, hoist, and end trucks.

• Dynamic Load (Live Load): This refers to the weight of the material being lifted by the crane.

• Impact Factor: Accounts for the dynamic forces exerted on the crane during operation, such as sudden starts, stops, and swaying of the load.

• Wheel Spacing: The distance between the wheels on the crane bridge and end trucks affects how the overall load is distributed.

Wheel Load Calculation:

The EOT crane wheel load calculation determines the amount of weight each wheel needs to support. This is crucial for ensuring the crane operates within its safe working limits and to design the runway and supporting structure capable of handling the forces exerted by the crane.

Impact on Design:

Understanding these load factors allows engineers to design EOT cranes with:

• Appropriate structural strength: The crane bridge, trolley, and end trucks must be robust enough to withstand the combined static and dynamic loads.are chosen to handle the calculated wheel load.

• Optimal wheel selection: Wheels with the proper capacity and diameter 

• Safe runway design: The runway structure needs to be designed to support the total weight of the crane and the calculated wheel loads.

By considering these load factors during the design phase, manufacturers can ensure EOT cranes are safe, reliable, and capable of handling the intended loads throughout their operational life.

Optimizing Your EOT Crane: Load Capacity Based on EOT Crane Specifications

Selecting an EOT crane with the right load capacity is crucial for maximizing the performance and lifespan of your equipment. Here’s a deeper dive into how EOT crane specifications influence load capacity:

• Bridge Construction:
  • Single-girder cranes are typically designed for lighter loads. They offer a more compact and cost-effective solution for applications where weight limitations are known.
  • Double-girder cranes provide superior stability and increased load capacity. They are ideal for heavier loads or situations requiring more frequent lifting cycles.

• Hoist Capacity:
  • The lifting capacity of the hoist directly contributes to the overall load capacity of the EOT crane. Choosing a hoist with a capacity exceeding your heaviest lifts ensures a safety margin and prevents overloading.

• Trolley Design:
  • The trolley, which carries the hoist, also has a specific load capacity rating. It’s essential to consider the combined capacity of the hoist and trolley when determining the overall lifting capability of your EOT crane.

Optimizing for Your Needs:

By carefully evaluating these specifications, you can select an EOT crane that perfectly aligns with your lifting requirements. Here’s how:

• Identify Your Heaviest Loads: Always choose a crane with a capacity exceeding the weight of your heaviest lifts. This ensures a safety buffer and prevents overloading, which can lead to equipment damage and potential safety hazards.

• Consider Future Requirements: If you anticipate handling heavier loads in the future, factor in potential growth needs when selecting your crane’s capacity. Purchasing a crane with some extra capacity can save you from needing to replace it sooner than expected.

Benefits of Choosing the Right Capacity:

Matching your EOT crane’s load capacity to your specific needs leads to several benefits:

• Safety: Choosing the right capacity prevents overloading and potential equipment failure, ensuring a safer work environment.

• Efficiency: A properly sized crane allows for smooth handling of your loads without compromising safety, leading to increased efficiency in your operations.

• Cost-Effectiveness: You avoid unnecessary investment in a crane with a higher capacity than required. This translates to long-term cost savings.

Get the Right EOT Crane for Your Needs: Choosing the Right Load Capacity

Selecting the right EOT crane for your needs goes beyond simply choosing the model with the highest lifting capacity. Here’s a breakdown of key factors to consider when making this critical decision:

• Identify Your Lifting Requirements: Carefully analyze the weight and dimensions of the heaviest loads you’ll be lifting. This helps determine the minimum load capacity your EOT crane needs.

• Evaluate Duty Cycle: Consider how frequently you’ll be using the crane. Light-duty applications may be suitable for a crane with a lower capacity, while heavy-duty operations require a more robust crane with a higher capacity for long-term durability.

• Workspace Limitations: Measure the available height and width in your workspace to ensure the chosen EOT crane can operate freely without clearance issues.

Beyond Capacity:

While load capacity is a crucial factor, it’s not the only consideration. Here are some additional points to keep in mind:

• Lift Height: Ensure the chosen EOT crane offers sufficient lift height to meet your needs.

• Span: The crane’s span needs to cover the entire designated lifting zone within your workspace.

• Brand Reputation: Opt for a reputable EOT crane manufacturer known for quality and reliable equipment.

Making the Right Choice:

By carefully considering these factors alongside the load capacity, you can make an informed decision and select the perfect EOT crane that optimizes your lifting operations for safety, efficiency, and cost-effectiveness. Don’t hesitate to consult with Krishna Crane Engineers a qualified EOT crane supplier for expert guidance on selecting the ideal crane for your specific needs.

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