Possibly there is none in society who hasn’t seen a crane in their lifetime. Cranes are mostly useful for lifting and lowering purposes. You must have seen cranes to be used in construction sites or in factories. Also, there are some other places like warehouses where the cranes are essential. The main function of a crane is to lift or lower the heavy amount of loads that other machines can’t lift.
Also, the cranes are useful to move too heavy loads from one place to another. A crane is gigantic in size and has a complex structure. Also, a crane includes several individual industrial power tools like- hoists, chains, wire ropes, sheaves, etc. The combined efforts of all the individual tools get the job of the crane done.
Here we are going to discuss two specific types of cranes. Further discussion will actually be a detailed analysis of the features of these two types and their differences. The two types are accordingly- Single Girder EOT Cranes and Double Girder EOT Cranes. Now, we are going to determine all the structural and functional dissimilarities of these two types of cranes.
Single Girder EOT Crane vs Double Girder EOT Crane— All the differences
Firstly, let’s discuss the structural differences that these two types of cranes have.
- You might have understood the basic difference between these two from the names. A single girder EOT crane has only a single girder within the whole structure. On the other hand, a double girder one includes two girders. Now, what are girders? In simple words, girders are the metal beams forming the bridge between the side travelling mechanisms.
- A single girder one has an electrical hoist to travel on the lower flange of the sole and main girder. The double girder crane includes no hoist. Instead of that, it has a unique crab-shaped mechanism that travels over both the girders.
- Single girder EOT cranes don’t require separate cross-travelling rails and platforms for the maintenance of parts. But the other ones have these requirements necessarily.
- You won’t be able to find out continuous platforms in the single girder cranes. Those have a total of three platforms, two small ones around the motor, and the rest one are for panel maintenance. A double girder machine has a continuous platform and also has a different platform along with the crab-shaped structure.
- There are no certain schedules for factory workers or repairmen. Sometimes they have to work at night. In such cases, double girder machines are more favourable as those include under bridge lights to eliminate the risks of accidents. The single girder EOT cranes don’t have such a feature.
- The motors and the gearboxes of these cranes are also pretty different. The single girder cranes are usually equipped with flange-mounted motors and modular gearboxes. On the contrary, the double girder cranes often provide foot mounted motors and horizontal gearboxes.
Now we are pointing out the functional differences between these two.
- You can avail of the pendent and radio remote system to monitor a single girder crane. But you can’t access the operating cabin to do so. All three ways are accessible in the case of a double girder EOT crane.
- A DC disk brake is all that a single girder crane can offer you to stop the function. But you can get the DCdisk brake and EHT brake combo with no brake-using limitation in a double girder one.
- In a single girder crane, the operators can control the up-down movement of the hoist through a snap action limit switch. A wire rope guide actuates the function of the switch. A double girder crane offers you the control through a rotary limit switch that has a geared system. That particular system is capable of calculating the movement of the hook and can limit the up-down movement. Along with that, there’s also a gravity limit switch to make the entire process more secure.
- The maximum span of the functional area and the lifting capacity also differ. The maximum functional area of a single girder crane is around 30 meters. It is capable of lifting loads up to 10 tons at a time. The functional area and lifting capacity of a double girder crane is way more than a single girder one. With a double girder crane, you can lift and move weights up to 500 tons at a time.
- The single girder cranes are mostly for lighter usage, and it can handle normal materials. But you can use a double girder crane for any kind of usage and to handle any type of material.
- The lighter weight of a single girder crane makes the wheel load much lesser. The small gantry girder fits the size of the crane. Undoubtedly, with the heavier weight of a double girder crane, the gantry girder size is also heavier.
- The double girder cranes are a bit pricier than the single girder cranes. The price increases according to weight-taking capacity and size. Although, the double girder cranes are easier and cheaper to maintain than the single girder cranes.
These are the points where both types of cranes differ. You have to choose one of those considerately according to your own requirements.
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