Monday 22 April 2013

Know more about Crane Controls!...



Upfront work is required in specifying and getting the correct overhead bridge crane for your application. It will be worth your effort, getting the right piece of material handling equipment for your facility. An afterthought in the overall scope of work is often putting a bridge crane into your new or existing building. To present to your architect, or crane sales person, following is a list of questions.
The type of crane needed is the first question. Below is a short list of the types, if you are not familiar with the type of cranes. Each has their own pros and cons.
a. Workstation crane system. For lighter weights 2 tons, these type of cranes are typically used and in applications of 1 ton and under, under although they are usually used. Lightweight, pre-engineered, and relatively inexpensive are included in the advantages. Limited capacities are included in the disadvantages.
b. Top running single and double girder. In heavier applications, these cranes are used. The trolley hoist runs on the bottom flange of the bridge beam, in a single girder application. Reduced cost versus double girder and effective crane controls is included in the advantages and lighter wheel loading thus reducing building and/or runway costs. Less hook height possible, not as durable and trolley is in a suspended position versus running on top of bridge beams (on heavy applications premature beam wear has been noted) is included in the disadvantages.
A double girder design should be considered, for truly heavy duty designs. On top of two bridge beams on ASCE rail, the trolley rides. Such as steel service centers, concrete facilities, foundries, and aerospace to name a few, this is a superior design for heavy applications. Such as walkways and cabs, advantages include superior durability and more options available. Heavier wheel loads and cost are included in the disadvantages.
c. Under running single and double girder design. As lighter duty than top running cranes, under running cranes are normally thought of. On the bottom flange of the beams and premature wear can occur with heavy duty cycles, this is due to all of the running surfaces for the crane and trolley hoist. Advantages encompass better hook coverage and to hang from your building structure on new buildings, it can be designed. Typically lighter duty cycle is included in disadvantages
d. Gantry Cranes. When you are limited in building structure, gantry cranes can solve numerous issues. With the opposite end running on the floor, or be completely independent of your building, they can be provided in numerous configurations and can run on one runway. Special track or ASCE rail is required by some, and some can run on the floor trackless. Crane controls Single girder and double girder is included in configurations.

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